pharyngitis

description: Inflammation of the throat most often caused by viral and bacterial infections. Other causes include allergens, chemical substances, and trauma.


necrotizing fasciitis

category: biolink:Disease biolink:DiseaseOrPhenotypicFeature biolink:BiologicalEntity biolink:ThingWithTaxon biolink:NamedThing

description: Necrotizing fasciitis is a serious infection of the skin, the tissue just beneath the skin (subcutaneous tissue), and the tissue that covers internal organs (fascia). Necrotizing fasciitis can be caused by several different types of bacteria, and the infection can arise suddenly and spread quickly. Early signs include flu-like symptoms and redness and pain around the infection site. A prompt diagnosis and treatment are essential.If the infection is not treated promptly, it can lead to multiple organ failure and death. Treatment typically includes intravenous (IV) antibiotics and surgery to remove infected and dead tissue.


benign paroxysmal positional vertigo

description: Idiopathic recurrent vertigo associated with positional nystagmus. It is associated with a vestibular loss without other neurological or auditory signs. Unlike in labyrinthitis and vestibular neuronitis inflammation in the ear is not observed.


short bowel syndrome

description: Short bowel syndrome is an intestinal failure due to either a congenital defect, intestinal infarction or extensive surgical resection of the intestinal tract that results in a functional small intestine of less than 200cm in length and is characterized by diarrhea, nutrient malabsoption, bowel dilation and dysmobility.


RASopathy

description: Developmental syndromes caused by germline mutations (or in rare cases by somatic mosaicism) in genes that alter the Ras subfamily and mitogen-activated protein kinases that control signal transduction.


gonorrhea

description: A common sexually transmitted bacterial infection caused by Neisseria gonorrhoeae. It is transmitted through vaginal, oral, or anal intercourse. Infected individuals may be asymptomatic. Symptoms in males include burning sensation during urination, discharge from the penis, and painful swelling of the testes. Symptoms in females include painful urination, vaginal discharge, and vaginal bleeding between periods. If untreated, the infection may lead to pelvic inflammatory disease.


neuroleptic malignant syndrome

description: Neuroleptic malignant syndrome (NMS) is an idiosyncratic condition associated with administration of antipsychotic and other central dopaminergic blockers, and characterized by hyperthermia, muscular rigidity, autonomic dysfunction and altered consciousness.


cornea plana

description: A rare developmental defect of the eye characterized by usually bilateral absence of the normal protrusion of the cornea from the sclera, the corneal curvature being the same as that of the adjacent sclera. Most patients develop hyperopia, hazy corneal limbus, and arcus lipoides at an early age. The condition may present as an autosomal dominant or an autosomal recessive form, with the latter showing more severe signs and symptoms (such as a round and opaque thickening located centrally in the cornea) and more frequent association with other ocular anomalies.


gastroesophageal cancer

description: A gastrointestinal system cancer that is located in the proximal esophagus and the distal stomach.


ectropion

description: The turning outward (eversion) of the edge of the eyelid, resulting in the exposure of the palpebral conjunctiva. (Dorland, 27th ed)


nanophthalmia

description: Nanophthalmia is a severe form of microphthalmia characterized by a small eye with a short axial length, severe hyperopia, an elevated lens/eye ratio, and a high incidence of angle-closure glaucoma.


ganglioneuroma

description: A benign neuroblastic tumor of the sympathetic nervous system that occurs in childhood. Ganglioneuroma typically arises from the sympathetic trunk in the mediastinum. Histologic features include spindle cell proliferation (resembling a neurofibroma) and the presence of large ganglion cells. Common presenting features include a palpable abdominal mass, hepatomegaly, and a thoracic mass detected on routine chest X-ray.


staphyloenterotoxemia

description: Food poisoning that is caused by Staphylococcal infection.


ochronosis disorder

description: A disorder characterized by bluish-black discoloration of the cartilaginous tissues due to accumulation of homogentisic acid. It is associated with alkaptonuria. Signs and symptoms include dark urine, skin pigmentation, and arthritis.


chromosome 1q41-q42 deletion syndrome

description: 1q41q42 microdeletion syndrome is a chromosomal anomaly characterized by a severe developmental delay and/or intellectual disability, typical facial dysmorphic features, brain anomalies, seizures, cleft palate, clubfeet, nail hypoplasia and congenital heart disease.


hepatitis E virus infection

description: Acute inflammation of the liver in humans; caused by hepatitis E virus, a non-enveloped single-stranded rna virus. Similar to hepatitis A, its incubation period is 15-60 days and is enterically transmitted, usually by fecal-oral transmission.


tenosynovial giant cell tumor

description: A tumor usually arising in the synovium of joints, bursa or tendon sheath. It is characterized by the presence of mononuclear cells, multinucleated osteoclast-like giant cells, hemosiderin-laden macrophages, foam cells, and an inflammatory infiltrate. According to the growth pattern, it is classified as localized or diffuse.


juvenile xanthogranuloma

description: A benign histiocytic tumor that occurs during childhood; it is distinct from Langerhans cell histiocytosis. It is characterized by the presence of lipid-laden, foamy histiocytes and Touton-type giant cells in the dermis. The lesions usually develop during infancy. They consist of cutaneous papules and nodules (most often in the head and neck). It is sometimes associated with deep soft tissues nodules.


protein-energy malnutrition

description: A nutritional deficit that is caused by inadequate protein or calorie intake.


pituitary hypoplasia

description: Incomplete development of the pituitary gland.


name: spastic paraplegia 80, autosomal dominant


anthrax infection

description: An infection caused by Bacillus anthracis bacteria. It may affect the lungs, gastrointestinal tract, or skin. Patients with lung infection present with fever, headaches, cough, chest pain and shortness of breath. Patients with gastrointestinal infection present with nausea, vomiting and bloody diarrhea. Patients with skin infection develop blisters and ulcers.


sporotrichosis

description: The commonest and least serious of the deep mycoses, characterized by nodular lesions of the cutaneous and subcutaneous tissues. It is caused by inhalation of contaminated dust or by infection of a wound.


scurvy

description: A condition that develops in people who do not consume an adequate amount of vitamin C in their diet. Although scurvy is relatively rare in the United States, it continues to be a problem in malnourished populations around the world (such as impoverished, underdeveloped third world countries). Early features of the condition include general weakness, fatigue and aching limbs. If left untreated, more serious problems can develop such as anemia, gum disease, and skin hemorrhages. Symptoms generally develop after at least 3 months of severe or total vitamin C deficiency. Scurvy can be cured with vitamin C supplements taken by mouth. Once recovery is complete, dietary modifications to ensure the 'recommended daily intake' of vitamin C is reached will prevent relapse. Except in the case of severe dental disease, permanent damage from scurvy does not usually occur.


urethral stricture

description: Narrowing of any part of the urethra. It is characterized by decreased urinary stream and often other obstructive voiding symptoms.


human African trypanosomiasis

description: A parasitic disorder caused by protozoa of the Trypanosoma brucei species. It is transmitted by flies and is endemic in various regions of Sub-Saharan Africa. Signs and symptoms include fever, joint pain, headache, and significant swelling of the lymph nodes. If left untreated, the parasitic infection causes anemia, heart, kidney, and endocrine failure, and neurologic damage. Subsequently patients develop confusion, disruption of the sleep cycle, and mental deterioration. The infection may lead to coma and death.


complex regional pain syndrome

description: Complex regional pain syndrome (CRPS) is a rare neurologic disease painful progressive condition that corresponds to a group of disorders characterized by a disproportionate spontaneous or stimulus-induced pain, accompanied by a variably mixed myriad of autonomic and motor disorders including symptoms such as swelling, allodynia, skin blood supply and trophic disturbances. CRPS most often affects one of the arms, legs, hands, or feet and usually occurs after an injury or trauma to that limb.


Middle East respiratory syndrome

description: A viral respiratory infection that is caused by the MERS coronavirus (MERS-CoV), which most often manifests with moderate to severe respiratory symptoms, including productive cough and shortness of breath, which can progress to pneumonia and acute respiratory distress syndrome.


name: subepithelial mucinous corneal dystrophy

description: Subepithelial mucinous corneal dystrophy (SMCD) is a very rare form of superficial corneal dystrophy characterized by frequent recurrent corneal erosions in the first decade of life, with progressive loss of vision.


X-linked dominant disease

description: X-linked dominant form of disease.


blepharophimosis

description: The abnormal narrowness of the palpebral fissure in the horizontal direction caused by the lateral displacement of the medial canthi of the eyelids. (Dorland, 27th ed)


chromosome 19q13.11 deletion syndrome

description: The 19q13.11 microdeletion is characterized by several major features including pre and postnatal growth retardation, slender habitus, severe postnatal feeding difficulties, microcephaly, intellectual deficit with speech disturbance, hypospadias and ectodermal dysplasia presented by scalp aplasia, thin and sparse hair, eyebrows and eyelashes, thin and dry skin and dysplasic nails.


VEXAS syndrome

description: An adult-onset inflammatory disease that affects only males and is caused by somatic, not germline, mutations. The disorder is characterized by adult onset of rheumatologic symptoms at a mean age of 64 years. Features include recurrent fevers, pulmonary and dermatologic inflammatory manifestations, vasculitis, deep vein thrombosis, arthralgias, and ear and nose chondritis. Laboratory studies indicate hematologic abnormalities, including macrocytic anemia, as well as increased levels of acute-phase reactants; about half of patients have positive autoantibodies. Bone marrow biopsy shows degenerative vacuolization restricted to myeloid and erythroid precursor cells, as well as variable hematopoietic dyspoiesis and dysplasias. The condition does not respond to rheumatologic medications and the features may result in premature death.


malignant myoepithelioma

description: An infiltrating malignant tumor characterized by the presence of atypical cells with myoepithelial differentiation. Representative examples include malignant breast myoepithelioma and salivary gland myoepithelial carcinoma.


myoepithelial tumor

description: A benign or malignant tumor characterized by the presence of cells that show myoepithelial differentiation. Based on its morphologic features, it is classified as benign or malignant. A representative example of benign myoepithelioma is benign salivary gland myoepithelioma. Representative examples of malignant myoepithelioma or myoepithelial carcinoma are malignant breast myoepithelioma and salivary gland myoepithelial carcinoma.


name: motor developmental delay due to 14q32.2 paternally expressed gene defect

description: A cause of obesity that results from inheritance of two copies of chromosome 14 from the mother, and no copy of chromosome 14 from the father.


premature ejaculation

description: A disorder characterized by persistent or recurrent ejaculation before or after penetration and before the person wishes it.


priapism

description: Persistent and usually painful erection that lasts for at least four hours in the absence of physical or psychological stimulation, which can be caused by hematologic disorders, including sickle cell disease and leukemia, spinal cord injuries, and medications.


X-linked recessive disease

description: X-linked recessive form of disease.


leiomyoma cutis

description: A benign smooth muscle neoplasm arising from the arrector pili muscle, tunica media of blood vessels, and dartos muscle of the genitalia. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern.


chondroblastoma

description: A benign, chondroid-producing, well-circumscribed, lytic neoplasm usually arising from the epiphysis of long bones. It is characterized by the presence of chondroblasts, osteoclast-like giant cells, chondroid formation, calcification, and mitotic activity. In aggressive cases, there is rearrangement of the 8q21 chromosome band. It occurs most frequently in children and young adults and rarely metastasizes.


ossifying fibroma

description: A well circumscribed lesion of the bone, most frequently arising from the posterior mandible. It is characterized by the presence of fibrous tissue and a mineralized component which may be woven bone, lamellar bone, or cementum-like material. Complete removal is recommended, since it continues to enlarge if left untreated.


heavy chain disease

description: Heavy-chain diseases (HCDs) are rare monoclonal lymphoplasma-cell proliferative disorders involving B cells and are characterized by the synthesis of truncated heavy chains without associated light chains.


scotoma

description: A localized defect in the visual field bordered by an area of normal vision. This occurs with a variety of eye diseases (e.g., retinal diseases and glaucoma); optic nerve diseases, and other conditions.


glomangioma

description: A morphologic variant of the glomus tumor characterized by the presence of dilated veins, surrounded by small clusters of glomus cells. Glomangiomas are most often present in patients with multiple lesions.


phaeohyphomycosis

description: An opportunistic fungal infection caused by any of a variety of normally saprophytic fungi with hyaline hyphal elements. For example, Fusarium spp. infect neutropenic patients to cause pneumonia, fungemia, and disseminated infection with cutaneous lesions.


dermatophytosis

description: A common fungal infection of the stratum corneum of the skin, hair, or nails by a dermatophyte. It is characterized by itching, inflammation, redness of the skin, small papular vesicles, central clearing, fissures, scaling, and/or hair loss in the affected area.


purpura

description: A small blood vessel hemorrhage into the skin and/or mucous membranes. Newer lesions appear reddish in color. Older lesions are usually a darker purple color and eventually become a brownish-yellow color.


telangiectasis

description: Local dilatation of small vessels resulting in red discoloration of the skin or mucous membranes.


cartilage-hair hypoplasia

description: Cartilage-hair hypoplasia is a disease affecting the bone metaphyses causing small stature from birth.


ankyloglossia

description: A developmental abnormality in which the bottom of the tongue is attached to the floor of the mouth.


arcus senilis

description: A corneal disease in which there is a deposition of phospholipid and cholesterol in the corneal stroma and anterior sclera.


muscle cancer

description: A malignant neoplasm affecting the skeletal or smooth muscles. Malignant neoplasms arising from the skeletal muscles are called rhabdomyosarcomas. Malignant neoplasms arising from the smooth muscles are called leiomyosarcomas.


acute disseminated encephalomyelitis

description: Acute disseminated encephalomyelitis (ADEM) is a demyelinating disorder of the central nervous system.


dental abscess

description: A tooth disease characterized by a localized collection of pus associated with a tooth.


enthesopathy

description: A disorder involving the attachment of a tendon or ligament to a bone


akinetic mutism

description: A syndrome characterized by a silent and inert state without voluntary motor activity despite preserved sensorimotor pathways and vigilance. Bilateral frontal lobe dysfunction involving the anterior cingulate gyrus and related brain injuries are associated with this condition. This may result in impaired abilities to communicate and initiate motor activities. (From Adams et al., Principles of Neurology, 6th ed, p348; Fortschr Neurol Psychiatr 1995 Feb;63(2):59-67)


astroblastoma

description: Astroblastoma is a very rare glial neoplasm of the central nervous system, most often with an intra-axial peripheral supratentorial location in one hemisphere of the frontal or parietal lobes and usually presenting in infants and young adults with symptoms of vomiting, loss of consciousness, epileptic seizures and headaches.


corneal edema

description: Hazy, swollen cornea.


serous adenocarcinoma

description: An adenocarcinoma that is characterized by the presence of papillary patterns and cellular budding. Psammoma bodies may be present. Representative examples include cervical serous adenocarcinoma, endometrial serous adenocarcinoma, ovarian serous adenocarcinoma, and primary peritoneal serous adenocarcinoma.


central pontine myelinolysis

description: A central nervous system disorder caused by demyelination within the central basis pontis of the brain. It is characterized by spastic quadriplegia, pseudobulbar palsy and encephalopathy. It is observed in patients with severe hyponatremia, particularly when the hyponatremia is corrected too rapidly.


cavernous hemangioma

description: A hemangioma characterized by the presence of cavernous vascular spaces.


fusariosis

description: Fusariosis describes a superficial, locally invasive, disseminated infection with the pathogenic fungus species, Fusarium, often found in soil and water, which is mainly transmitted to humans through traumatic inoculation and that manifests with keratitis, onychomycosis and less frequently peritonitis and cellulitis. In the immunocompromised, disseminated fusariosis is more common and it manifests with refractory fever, skin lesions (ecthyma-like, target, and multiple subcutaneous nodules), severe myalgias and sino-pulmonary infections.


name: juvenile polyposis-hereditary hemorrhagic telangiectasia syndrome


mesenchymal cell neoplasm

description: A benign, intermediate, or malignant neoplasm that arises from the mesenchyma-derived cells of the soft tissue or bone. Representative examples include lipoma, leiomyoma, leiomyosarcoma and osteosarcoma.


trochlear nerve disorder

description: A disease involving the trochlear nerve.


mumps infectious disease

description: A contagious viral infection caused by the mumps virus. Symptoms include swollen and tender parotid glands, fever, muscle aches and fatigue. Due to vaccination programs, mumps has become a rare disease.


rubella

description: A viral infection caused by the rubella virus. It is initially manifested with flu-like symptoms that last one or two days, followed by the development of a characteristic red rash which lasts from one to five days. The rash first appears in the neck and face. It subsequently spreads to the rest of the body.


hepatitis A virus infection

description: Acute inflammation of the liver caused by the hepatitis A virus. It is highly contagious and usually contracted through close contact with an infected individual or their feces, contaminated food or water.


inborn serine deficiency

description: An inherited metabolic disease that is has its basis in the disruption of L-serine biosynthetic process.


synostosis

description: A disease characterized by abnormal union between adjacent bones or parts of a single bone formed by osseous material, such as ossified connecting cartilage or fibrous tissue.


biliary dyskinesia

description: A motility disorder characterized by biliary colic, absence of gallstones, and an abnormal gallbladder ejection fraction. It is caused by gallbladder dyskinesia and/or sphincter of oddi dysfunction.


autonomic neuropathy

description: An inherited or acquired peripheral neuropathy affecting the autonomic nervous system. It results in disruption of the involuntary body functions. Inherited causes include Fabry disease and porphyrias. Acquired causes include diabetes, uremia, hepatic disorders, vitamin deficiencies, toxins, and drug toxicities.


spinal stenosis

description: Narrowing of the spinal canal.


spondylolisthesis

description: A condition in which there is forward displacement of a vertebral bone over the on below it.


root resorption

description: Resorption in which cementum or dentin is lost from the root of a tooth owing to cementoclastic or osteoclastic activity in conditions such as trauma of occlusion or neoplasms. (Dorland, 27th ed)


gas gangrene

description: A severe condition resulting from bacteria invading healthy muscle from adjacent traumatized muscle or soft tissue. The infection originates in a wound contaminated with bacteria of the genus clostridium. C. perfringens accounts for the majority of cases (over eighty percent), while C. noyvi, C. septicum, and C. histolyticum cause most of the other cases.


Nelson syndrome

description: A syndrome that develops following bilateral adrenalectomy for Cushing syndrome. The signs and symptoms result from the presence of an adenocorticotropin-secreting pituitary gland adenoma, and include enlargement of the sella turcica and pressure on the adjacent structures, and skin hyperpigmentation.


long COVID-19

description: A chronic disease triggered by acute COVID-19 infection that is characterized by persistent symptoms following the acute phase of the SARS-CoV-2 infection, which may include fatigue, coughing, dyspnea, clouding of mentation, sleep disturbances, exercise intolerance and autonomic symptoms including tachycardia upon mild exercise or standing, night sweats, temperature dysregulation, gastroparesis, constipation or loose stools, and peripheral vasoconstriction.


brachial plexus neuropathy

description: A brachial plexus disorder characterized by regional paresthesia, pain and muscle weakness, and limited movement in the arm or hand.


band keratopathy

description: The deposition of calcium on the cornea, resulting in pain and decreased visual acuity.


kidney sarcoma

description: A sarcoma involving a kidney.


molluscum contagiosum

description: A common, benign, usually self-limited viral infection of the skin and occasionally the conjunctivae by a poxvirus (molluscum contagiosum virus). (Dorland, 27th ed)


adrenal rest tumor

description: A benign, testicular or ovarian tumor, derived from adrenal embryonic rest cells. It is composed of hyperplastic adrenal cortical tissue, and it is associated with congenital adrenal hyperplasia.


ganglioglioma

description: A well differentiated, slow growing neuroepithelial neoplasm composed of neoplastic, mature ganglion cells and neoplastic glial cells. Some gangliogliomas show anaplastic features in their glial component and are considered to be WHO grade III. Rare cases of newly diagnosed gangliogliomas with grade IV (glioblastoma) changes in the glial component have also been reported. (Adapted from WHO)


fallopian tube cancer

description: A primary or metastatic malignant neoplasm that affects the fallopian tube. Representative examples include carcinoma, carcinosarcoma, and leiomyosarcoma.


Keshan disease

description: A congestive cardiomyopathy caused by a combination of dietary deficiency of selenium and the presence of a mutated strain of Coxsackievirus.


name: multiple congenital anomalies due to 14q32.2 maternally expressed gene defect

description: A rare genetic disease characterized by polyhydramnios (mostly due to placentomegaly), fetal macrosomia, abdominal wall defects, skeletal abnormalities (including bell-shaped thorax, coat-hanger appearance of the ribs and decreased mid to wide thorax diameter ratio in infancy), feeding difficulties and impaired swallowing, dysmorphic features (hairy forehead, full cheeks, protruding philtrum, micrognathia), developmental delay and intellectual disability. Additional features may include kyphoskoliosis, joint contractures, diastasis recti, muscular hypotonia. There is increased risk of hepatoblastoma.


ascariasis

description: An infection that is caused by the roundworm Ascaris lumbricoides, many cases of which remain asymptomatic. During the transient larval migratory phase, shortness of breath, fever, and eosinophilia can occur. Depending on the intestinal worm burden, a spectrum of gastrointestinal tract symptoms can occur.


filarial elephantiasis

description: Parasitic infestation of the human lymphatic system by wuchereria bancrofti or brugia malayi. It is also called lymphatic filariasis.


onchocerciasis

description: Onchocerciasis is a form of filariasis, caused by the parasitic worm Onchocerca volvulus, transmitted by the black fly. The infection can either be asymptomatic or manifest as an ocular disease (river blindness) with itchy eyes, erythema, photophobia, onchodermatitis or onchocercal skin disease (classified into acute papular, chronic papular, lichenified, atrophic, and depigmentated) and onchocercomas (over bony prominences). Other classic clinical manifestations are ichthyosis-like lesions (''lizard skin'') and ''hanging groin'', which may be associated with lymphadenopathy.


trachoma

description: A chronic infection of the conjunctiva and cornea caused by chlamydia trachomatis.


nasal cavity cancer

description: A malignant neoplasm involving the nasal cavity


paranasal sinus carcinoma

description: A malignant epithelial neoplasm arising in the paranasal sinus.


name: tenosynovial giant cell tumor, diffuse type

description: A locally aggressive, diffusely infiltrating tumor, arising in the tendon sheath. It is composed of synovial-like mononuclear cells, hemosiderin-laden macrophages, foam cells, and inflammatory cells. Multinucleated osteoclast-like giant cells are usually present, although in a minority of cases they may be absent or rare. It predominantly affects young adults. Symptoms include joint swelling, pain, and joint effusion.


mixed connective tissue disease

description: Mixed connective tissue disease (MCTD) is a rare autoimmune disorder that is characterized by features commonly seen in three different connective tissue disorders: systemic lupus erythematosus, scleroderma, and polymyositis. Some affected people may also have symptoms of rheumatoid arthritis. Although MCTD can affect people of all ages, it appears to be most common in women under age 30. Signs and symptoms vary but may include Raynaud's phenomenon ; arthritis; heart, lung and skin abnormalities; kidney disease; muscle weakness, and dysfunction of the esophagus. The cause of MCTD is currently unknown. There is no cure but certain medications such as nonsteroidal anti-inflammatory drugs (NSAIDs), corticosteroids and immunosuppresivedrugsmay help manage the symptoms.


endophthalmitis

description: An infectious process affecting the internal structures of the eye.


retinal ischemia

description: A ischemic disease that involves the retina.


optic disk drusen

description: Optic disk bodies composed primarily of acid mucopolysaccharides that may produce pseudopapilledema (elevation of the optic disk without associated intracranial hypertension) and visual field deficits. Drusen may also occur in the retina (see retinal drusen). (Miller et al., Clinical Neuro-Ophthalmology, 4th ed, p355)


asbestos-related lung carcinoma

description: A carcinoma arising in the lung due to exposure to asbestos.


inverted papilloma

description: An endophytic benign papillary epithelial neoplasm that results from the invagination and proliferation of epithelial cells in the underlying stroma. Representative examples are the inverted urothelial papilloma that arises from the urinary tract and inverted Schneiderian papilloma that arises from the nasal cavity or paranasal sinuses.


actinic keratosis

description: A precancerous lesion of the skin composed of atypical keratinocytes. It is characterized by the presence of thick, scaly patches of skin. Several histologic variants have been described, including atrophic, acantholytic, and hyperkeratotic variants.


pancreatic adenocarcinoma

description: A carcinoma that arises from glandular epithelial cells of the pancreas


small intestine cancer

description: A primary or metastatic malignant neoplasm involving the small intestine.


name: superficial multifocal basal cell carcinoma

description: A superficial basal cell carcinoma of the skin characterized by the presence of lobules of basaloid cells which are separated by large distances and represent multifocal discrete tumors.


frozen shoulder

description: A painful inflammatory process leads to a mechanical block in active and passive range of motion (ROM) of the shoulder. Adhesive capsulitis of the shoulder is characterized by functional loss of passive and active shoulder motion. This inflammatory process results in fibroblastic proliferation and extensive scar tissue formation. Fibroblastic proliferation, a late phase of the inflammatory process involved in tissue repair, leads to thickening, fibrosis, and adhesion of the capsule to itself and the humerus.


acute diarrhea

description: Acute form of diarrhea.


atopic conjunctivitis

description: Conjunctivitis due to hypersensitivity to various allergens.


vasomotor rhinitis

description: Inflammation in the nasal cavity mucosa that results from the abnormal regulation of the blood flow in the nose. It may be caused by temperature fluctuations, air pollution, strong odors, and tobacco smoke. It results in chronic nasal congestion, sneezing, and running nose.


generalized anxiety disorder

description: An anxiety disorder characterized by excessive and difficult-to-control worry about a number of life situations. The worry is accompanied by restlessness, fatigue, inability to concentrate, irritability, muscle tension, and/or sleep disturbance and lasts for at least 6 months.


postencephalitic Parkinson disease

description: A disease believed to be caused by a viral illness that triggers degeneration of the nerve cells in the substantia nigra. Overall, this degeneration leads to clinical parkinsonism.


granuloma annulare

description: Granuloma annulare is a long-term (chronic) skin disease consisting of a rash with reddish bumps arranged in a circle or ring. The most commonly affected areas are the forearms, hands and feet. The lesions associated with granuloma annulare usually resolve without treatment. Strong steroids (applied as a cream or injection) are sometimes used to clear the rash more quickly. Most symptoms will disappear within 2 years (even without treatment), but recurrence is common. The underlying cause of granuloma annulare is unknown.


seborrheic dermatitis

description: A chronic, inflammatory skin disorder that affects the scalp, central face and skin folds; it is characterized by scaling and itching.


aphthous stomatitis

description: A recurrent disease of the oral mucosa of unknown etiology. It is characterized by small white ulcerative lesions, single or multiple, round or oval, lasting for 7-14 days and healing without scarring.


Prinzmetal angina

description: A syndrome typically consisting of angina (cardiac chest pain) at rest that occurs in cycles. It is caused by vasospasm, a narrowing of the coronary arteries caused by contraction of the smooth muscle tissue in the vessel walls rather than directly by atherosclerosis (buildup of fatty plaque and hardening of the arteries). For a portion of patients Prinzmetal's angina may be a manifestation of vasospastic disorder and is associated with migraine, Raynaud's phenomenon or aspirin-induced asthma.


tinea corporis

description: A dermatophyte disease of the glabrous skin, excluding the scalp, beard, face, hands, feet, and groin.


tinea pedis

description: Dermatological pruritic lesion in the feet, caused by Trichophyton rubrum, T. mentagrophytes, or Epidermophyton floccosum.


acquired thrombocytopenia

description: An instance of thrombocytopenia that is acquired during the lifetime of the individual.


bursitis

description: Inflammation or irritation of a synovial bursa, the fibrous sac that acts as a cushion between moving structures of bones, muscles, tendons or skin.


dermatitis herpetiformis

description: Dermatitis herpetiformis (DH) is a chronic autoimmune subepidermal bullous disease characterized by grouped pruritic lesions such as papules, urticarial plaques, erythema, and herpetiform vesiculae, with a predominantly symmetrical distribution on extensor surfaces of the elbows (90%), knees (30%), shoulders, buttocks, sacral region, and face of children and adults. Erosions, excoriations and hyperpigmentation usually follow. DH may also appear as a consequence of gluten intolerance.


scalp dermatosis

description: Dermotosis of scalp


epicondylitis

description: Inflammation of the lateral epicondyle.


trichinellosis

description: A zoonotic parasitic disease caused by the consumption of raw or undercooked meat (pork and wild game) infected by nematodes of the genus Trichinella and that is characterized by an enteral (intestinal) phase, that can be asymptomatic or that can manifests with diarrhea, nausea, vomiting and abdominal pain, and a parenteral (muscular) phase, manifesting with fever, periorbital edema, muscle swelling and pain, weakness, and in some cases, skin rash and peripheral edema. Rarely, potentially fatal cardiac (i.e. myocarditis), pulmonary (i.e. pneumonitis, respiratory failure), and nervous system (i.e. meningoencephalitis) complications may occur.


idiopathic acute eosinophilic pneumonia

description: Idiopathic acute eosinophilic pneumonia (IAEP) is an eosinophilic pneumonia of undetermined etiology that is characterized by acute febrile hypoxic respiratory failure associated with diffuse radiographic infiltrates and pulmonary eosinophilia, but without concurring allergy or infection.


miliary tuberculosis

description: I would say the hematogenous widespread dissemination of tuberculosis in the body. The term derives from the chest X-ray image of the tiny (1-5 mm) tuberculosis lesions which are seen through out the lung parenchyma.


rheumatic heart disease

description: An autoinflammatory condition following an infection with Group A Beta Hemolytic Streptococcus (GABHS), in which the heart is attacked by antibodies formed in reaction to a recent GABHS infection. Chief anatomic changes of the valve include leaflet thickening, commissural fusion, and shortening and thickening of the tendinous cords, all of which can result in valvular dysfunction.


tendinitis

description: Inflammation of a tendon, usually resulting from an overuse injury. It is characterized by swelling of the tendon, tenderness around the inflamed tendon, and pain while moving the affected area of the body.


tenosynovitis

description: Inflammation of the synovial lining of a tendon sheath. Causes include trauma, tendon stress, bacterial disease (gonorrhea, tuberculosis), rheumatic disease, and gout. Common sites are the hand, wrist, shoulder capsule, hip capsule, hamstring muscles, and Achilles tendon. The tendon sheaths become inflamed and painful, and accumulate fluid. Joint mobility is usually reduced.


name: dermatophytosis of groin and perianal area

description: Dermatophytosis involving the stratum corneum of the skin of the groin and perianal area.


hypertrichosis of eyelid

description: A hypertrichosis (disease) that involves the eyelid.


motion sickness

description: A sensation of discomfort that results from a discordant relationship between visualized movement and any movement sensed by the vestibular system, which is characterized by dizziness, nausea, and vomiting.


glossopharyngeal neuralgia

description: Glossopharyngeal neuralgia is a condition characterized by repeated episodes of severe pain in the tongue, throat, ear, and tonsils (areas connected to the ninth cranial nerve, or glossopharyngeal nerve). It typically occurs in individuals over age 40. Episodes of pain may last from a few seconds to a few minutes, and usually occur on one side. The pain may be triggered by swallowing, speaking, laughing, chewing or coughing. The condition is thought to be due to irritation of the nerve, although the source of irritation is unclear. The goal of treatment is to control pain, but over-the-counter pain medications are not very effective; the most effective drugs are anti-seizure medications. Some antidepressants help certain people. Surgery to cut or take pressure off of the glossopharyngeal nerve may be needed in severe cases.


brain glioblastoma

description: A WHO grade IV malignant astrocytic tumor that arises from the brain, usually the cerebral hemispheres. It is characterized by the presence of poorly differentiated astrocytes, cellular polymorphism, nuclear atypia, and increased mitotic activity. The prognosis is poor.


acute gonococcal cervicitis

description: Acute form of gonococcal cervicitis.


bacterial pneumonia

description: Acute infection of the lung parenchyma caused by bacteria (e.g., Streptococcus pneumoniae, Haemophilus influenzae, Chlamydia pneumoniae, Mycoplasma pneumoniae, and Legionella pneumophila). Signs and symptoms include productive cough, fever, chills, shortness of breath, and chest pain.


chancroid

description: Chancroid is a bacterial infection that is spread through sexual contact. It is caused by a type of bacteria called Haemophilus ducreyi. Chancroid is characterized by a small bump on the genital which becomes a painful ulcer. Men may have just one ulcer, but women often develop four or more.About half of the people who are infected with a chancroid will develop enlarged inguinal lymph nodes, the nodes located in the fold between the leg and the lower abdomen. In some cases, the nodes will break through the skin and cause draining abscesses. The swollen lymph nodes and abscesses are often called buboes. Chancroid infections can be treated with antibiotics, including azithromycin, ceftriaxone, ciprofloxacin, and erythromycin. Large lymph node swellings need to be drained, either with a needle or local surgery.


endometritis

description: An acute or chronic, usually bacterial infectious process affecting the endometrium. It may extend to the myometrium and parametrial tissues. Symptoms include lower abdominal pain, vaginal discharge, and vaginal bleeding.


rhinoscleroma

description: A granulomatous disease caused by klebsiella rhinoscleromatis infection. Despite its name, this disease is not limited to the nose and nasopharynx but may affect any part of the respiratory tract, sometimes with extension to the lip and the skin.


streptococcal meningitis

description: An infectious meningitis caused by infection with Streptococcus.


Plasmodium ovale malaria

description: An malaria caused by infection with Plasmodium ovale.


Plasmodium malariae malaria

description: Malaria resulting from infection by Plasmodium malariae.


Plasmodium vivax malaria

description: Malaria resulting from infection by Plasmodium vivax.


intermittent vascular claudication

description: A symptom complex characterized by pain and weakness in skeletal muscle group associated with exercise, such as leg pain and weakness brought on by walking. Such muscle limpness disappears after a brief rest and is often relates to arterial stenosis; muscle ischemia; and accumulation of lactate.


intracranial embolism

description: Blocking of a blood vessel in the skull by an embolus which can be a blood clot (thrombus) or other undissolved material in the blood stream. Most emboli are of cardiac origin and are associated with heart diseases. Other non-cardiac sources of emboli are usually associated with vascular diseases.


pityriasis versicolor

description: A yeast infection usually manifested as a superficial skin infection. It may also present as a systemic infection in patients who are receiving total parenteral nutrition.


blepharoconjunctivitis

description: Inflammation of both the eyelids and the conjunctiva.


otitis externa

description: Inflammation of the anatomical structures of the outer ear and ear canal secondary to an infectious process. Bacterial etiology is most common, but fungal infection is also possible. Symptoms include erythema, edema, and pain.


iridocyclitis

description: An inflammation of the iris and the ciliary body


iritis

description: Inflammation of the iris.


proctitis

description: An inflammatory process affecting the anus. It is usually caused by sexually transmitted infectious agents and/or inflammatory bowel disease.


cycloplegia

description: Cycloplegia is paralysis of the ciliary muscle of the eye, resulting in a loss of accommodation.


breast fibrocystic disease

description: Fibrosis associated with cyst formation in the breast parenchyma.


allergic urticaria

description: A urticaria with a basis in a pathological type I hypersensitivity reaction.


description: A type of keratitis characterized by inflammation in pinpoint areas of the corneal epithelium.


acute cystitis

description: An acute infection of the bladder. It is usually caused by bacteria. Signs and symptoms include increased frequency of urination, pain or burning during urination, fever, cloudy or bloody urine, and suprapubic pain.


female stress incontinence

description: The involuntary loss of urine in females secondary to insufficient strength of the pelvic floor muscles; this can result from physical changes following pregnancy and childbirth, or as a response to a decrease in estrogen during menopause.


esotropia

description: A form of strabismus in which one or both eyes are deviated medially.


kidney angiomyolipoma

description: An angiomyolipoma arising from the kidney.


malignant essential hypertension

description: Essential hypertension with rapid progression to severe high blood pressure, papilledema, and renal failure.


choroiditis

description: An inflammatory process that affects the choroid.


allergic asthma

description: A asthma with a basis in a pathological type I hypersensitivity reaction.


intrinsic asthma

description: An asthma that is triggered by factors not related to allergies such as anxiety, stress, exercise, cold air, dry air, hyperventilation, smoke, viruses, chemical irritants, autonomic imbalance, hormonal deficiencies and psychogenic influences. It is characterized by airway obstruction and inflammation that is at least partially reversible with medication. The symptoms include coughing, wheezing, shortness of breath or rapid breathing, and chest tightness.


social phobia

description: An anxiety disorder characterized by an intense, irrational fear of one or more social or performance situations in which the individual believes that he or she will be scrutinized by others. Exposure to social situations immediately provokes an anxiety response. In adults, the social phobia is recognized as excessive or unreasonable.


name: anogenital human papillomavirus infection

description: A sexually transmitted papillary growth caused by the human papillomavirus. It usually arises in the skin and mucous membranes of the perianal region and external genitalia.


common wart

description: A wart caused by human papillomavirus. It can appear anywhere on the skin.


blastomycosis

description: Blastomycosis is a rare infection that may develop when people inhale a fungus called Blastomyces dermatitidis, a fungus that is found in moist soil, particularly where there is rotting vegetation. The fungus enters the body through the lungs, infecting them. The fungus then spreads to other areas of the body.The infection may affect the skin, bones and joints, and other areas. The disease usually affects people with weakened immune systems, such as those with HIV or who have had an organ transplant.


esophageal candidiasis

description: Esophagitis resulting from Candida.


histoplasmosis

description: A disease caused by the fungus Histoplasma capsulatum. It primarily affects the lungs but can also occur as a disseminated disease that affects additional organs. The acute respiratory disease has symptoms similar to those of a cold or flu and it usually resolves without treatment in healthy individuals. The disseminated form is generally fatal if untreated.


chromomycosis

description: Chromomycosis is a chronic cutaneous and subcutaneous fungal infection, found mainly in subtropical and tropical areas (in soil and plant debris and transmitted by traumatic inoculation), and characterized clinically by slow growing, verrucous nodules, squamous plaques, or chronic limited lesions which are most commonly found on the lower limbs and which are characterized histologically by the presence of muriform cells. It is caused by dematiaceous fungi, with the main etiological agents being Fonsecaea pedrosoi, Phialophora verrucosa and Cladophialophora carrionii. Rarely, it can be caused by Rhinocladiella aquaspersa.


coccidioidomycosis

description: A fungal infection caused by Coccidioides immitis. Affected individuals usually have mild flu-like symptoms. However, pneumonia and systemic involvement with the formation of abscesses may develop as complications of the disease.


paracoccidioidomycosis

description: A systemic fungal infection caused by Paracoccidioides brasiliensis that is most often seen in immunocompromised patients. It affects the mucous membranes, lymph nodes, lungs and bones.


Pthirus pubis infestation

description: Infestation of the pubic hair by the pthirus pubis parasite which results in mild to intense itching and macular lesions. The parasite, also known as crab lice, is transmitted through skin to skin contact with an infected person or through direct contact with infested objects.


scabies

description: A contagious skin infection that is caused by the burrowing parasitic mite, Sarcoptes scabiei, and is characterized by intense itching and small, raised red spots in the area of the mite burrows.


Pediculus humanus capitis infestation

description: A infectious disease involving Pediculus humanus capitis.


urethritis

description: Inflammation of the urethra.


thromboangiitis obliterans

description: A rare inflammatory non-necrotizing vascular disease affecting the small- and medium-sized arteries and veins of the upper and lower extremities characterized by endarteritis and vaso-occlusion due to occlusive thrombus development. The development and progression of the disease is consistently associated with exposure to tobacco.


myxedema

description: A condition characterized by severe hypothyroidism that is caused by autoimmune thyroid gland disorders, surgical reduction of thyroid tissue, radiation exposure, and viral infections. Signs and symptoms include generalized fatigue, lethargy, increased body weight, pale, edematous and thickened skin, low blood pressure, constipation and cold intolerance.


impetigo

description: A contagious bacterial cutaneous infection that affects children and is usually caused by Staphylococcus aureus. It usually presents in the face with honey colored scabs.


pellagra

description: Pellagra is a nutritional disorder caused by a deficiency in niacin (vitamin B3) or its precursor (tryptophan) that is mainly observed in Asia and Africa where it is generally due to poor nutrition. It is characterized by dermatitis (symmetrical photodistributed erythema that may be accompanied by vesicles and bullae, and that develops into hyperkeratotic and hyperpigmented skin), gastrointestinal symptoms (diarrhea), and neuropsychiatric disorders (dementia). It can be life-threatening without a correct management.


fallopian tube carcinoma

description: A carcinoma that arises from epithelial cells of the fallopian tube.


malignant pleural mesothelioma

description: A malignant neoplasm that arises from mesothelial cells in the pleura and shows a diffuse growth pattern. It arises on the parietal and sometimes visceral pleura as multiple small nodules that later become confluent and invade the chest wall adipose tissue and muscle. Asbestos exposure is the main cause for the development of pleural malignant mesothelioma. It usually affects patients over sixty years of age. The latency period is long. Patients usually present with pleural effusion, dyspnea and chest wall pain. Additional signs and symptoms include chills, sweating, weight loss, and weakness. Morphologic variants include epithelioid, desmoplastic, sarcomatoid, and biphasic mesothelioma. The clinical course is usually aggressive.


bacterial conjunctivitis

description: Inflammation of the conjunctiva caused by a variety of bacterial agents.


dacryocystitis

description: Inflammation of the lacrimal sac.


eosinophilic pneumonia

description: An inflammatory lung disorder characterized by an increased number of eosinophils in the lungs. The majority of cases are idiopathic, without identifiable cause. In a minority of cases, medications, fungal infections, and environmental triggers have been implicated. It manifests as acute or chronic. Acute eosinophilic pneumonia is a severe and rapidly progressing pneumonia that may lead to respiratory failure requiring mechanical ventilation. Chronic eosinophilic pneumonia follows a slower course and manifests as fever, dyspnea, cough, and weight loss.


pulmonary eosinophilia

description: A condition characterized by infiltration of the lung with eosinophils due to inflammation or other disease processes. Major eosinophilic lung diseases are the eosinophilic pneumonias caused by infections, allergens, or toxic agents.


polymyalgia rheumatica

description: A syndrome characterized by pain, stiffness, and tenderness of the proximal muscle groups including the shoulder, pelvic girdle and the neck. There is no muscle atrophy and muscle biopsies do not reveal pathologic changes. Additional signs and symptoms include low grade fever, fatigue and depression.


sympathetic ophthalmia

description: Sympathetic ophthalmia (SO) is a bilateral granulomatous anterior uveitis usually occurring within the three months following trauma or a surgical procedure involving one eye.


thyroid crisis

description: Acute onset of severe, life-threatening hyperthyroidism caused by a sudden release of excessive thyroid hormone.


disappearing bone disease

description: Syndromes of bone destruction where the cause is not obvious such as neoplasia, infection, or trauma. The destruction follows various patterns: massive (Gorham disease), multicentric (hajdu-cheney syndrome), or carpal/tarsal.


lymphangioma

description: A benign lesion composed of dilated lymphatic channels. Painless swelling is the usual clinical manifestation.


bruxism

description: Excessive clenching of the jaw and grinding of the teeth.


dermatophytosis of scalp or beard

description: Dermatophytosis involving the stratum corneum of the skin of the scalp and beard area.


pseudotumor cerebri

description: Idiopathic intracranial hypertension is a neurological disorder characterized by isolated increased intracranial pressure manifesting with recurrent and persistent headaches, nausea, vomiting, progressive and transient obstruction of the visual field, papilledema. Visual loss can be irreversible.


lichen planus

description: A chronic, recurrent, pruritic inflammatory disorder of unknown etiology that affects the skin and mucus membranes. It presents with rashes and papules that tend to resolve spontaneously. It may be associated with hepatitis C. Certain drugs that contain arsenic or bismuth are associated with reactions mimicking lichen planus.


vernal conjunctivitis

description: Inflammation of the cornea that is seasonal in nature.


strongyloidiasis

description: An infection that is caused by nematodes of the genus Strongyloides, most commonly Strongyloides stercoralis, which is a soil-transmitted helminth, and which is characterized by a variety of gastrointestinal, dermatologic, and, occasionally, pulmonary manifestations. The worm's autoinfective life cycle can lead to hyper-infection and life-threatening dissemination in immunocompromised hosts decades after initial infection.


acquired generalized lipodystrophy

description: Acquired generalized lipodystrophy belongs to a group of lipodystrophic syndromes characterized by loss of adipose tissue, and is a syndrome of insulin resistance that leads to increased cardiovascular risk. Acquired generalized lipodystrophy is related to a selective loss of subcutaneous adipose tissue occurring exclusively at the extremities (face, legs, arms, palms and sometimes soles).


neovascular glaucoma

description: Neovascular glaucoma is the most common type of secondary glaucoma, usually caused by diabetic retinopathy, central retinal vein occlusion and carotid artery obstruction but sometimes by trauma, uvietis or ocular tumors, and characterized by severe eye pain, synechial angle glaucoma, high intraocular pressure and leading to loss of vision.


name: secondary progressive multiple sclerosis

description: A multiple sclerosis with a clinical course characterized by a progressive accumulation of neurological disability, independent of relapses, following an initial relapsing-remitting (RR) phase.


acute myocardial infarction

description: Necrosis of the myocardium, as a result of interruption of the blood supply to the area. It is characterized by a severe and rapid onset of symptoms that may include chest pain, often radiating to the left arm and left side of the neck, dyspnea, sweating, and palpitations.


primary progressive multiple sclerosis

description: A multiple sclerosis that is characterized by steady worsening of neurologic functioning, without any distinct relapses or periods of remission. The rate of progression may vary over time, with occasional plateaus or temporary improvements, but the progression is continuous.


description: A general class of thrombocytopenia due to immune destruction of platelets. It includes idiopathic thrombocytopenic purpura, as well as immune destruction-related thrombocytopenias due to other reasons (e.g., AIDS, transfusion, lupus erythematosus).


levobupivacaine

The (S)-(-)-enantiomer of bupivacaine.


levdobutamine

The (S)-enantiomer of dobutamine.


azacitidine

An N-glycosyl-1,3,5-triazine that is 4-amino-1,3,5-triazin-2(1H)-one substituted by a beta-D-ribofuranosyl residue via an N-glycosidic linkage. An antineoplastic agent, it is used in the treatment of myeloid leukaemia.


A nucleobase analogue that is uracil in which the hydrogen at position 5 is replaced by fluorine. It is an antineoplastic agent which acts as an antimetabolite - following conversion to the active deoxynucleotide, it inhibits DNA synthesis (by blocking the conversion of deoxyuridylic acid to thymidylic acid by the cellular enzyme thymidylate synthetase) and so slows tumour growth.


abarelix

A polypeptide compound composed of ten natural and non-natural amino acid resiudes in a linear sequence.


acamprosate

An  organosulfonic acid that is propane-1-sulfonic acid substituted by an acetylamino group at position 3.


acebutolol

An ether that is the 2-acetyl-4-(butanoylamino)phenyl ether of the primary hydroxy group of 3-(propan-2-ylamino)propane-1,2-diol.


acemetacin

A carboxylic ester that is the carboxymethyl ester of indometacin. A non-steroidal anti-inflammatory drug, it is used in the treatment of rheumatoid arthritis, osteoarthritis, and low back pain, as well as for postoperative pain and inflammation. Its activity is due to both acemetacin and its major metabolite, indometacin.


paracetamol

A member of the class of phenols that is 4-aminophenol in which one of the hydrogens attached to the amino group has been replaced by an acetyl group.


acetophenazine

A member of the class of  phenothiazines that is 10H-phenothiazine substituted by a 3-[4-(2-hydroxyethyl)piperazin-1-yl]propyl group at the nitogen atom and an acetyl group at position 2.


ACETYLCHOLINE CHLORIDE

The chloride salt of acetylcholine, and a parasympatomimetic drug.


acetyldigitoxin

A cardenolide glycoside compound consisting of digitoxin having an acetyl substituent at the 3-position on the D-ribo-hexopyranosyl residue at the non-reducing end.


acepromazine

A member of the class of  phenothiazines that is 10H-phenothiazine substituted by an acetyl group at position 2 and a 3-(dimethylamino)propyl group at position 10.


aspirin

A member of the class of benzoic acids that is salicylic acid in which the hydrogen that is attached to the phenolic hydroxy group has been replaced by an acetoxy group. A non-steroidal anti-inflammatory drug with cyclooxygenase inhibitor activity.


aclarubicin

An anthracycline antibiotic that is produced by Streptomyces galilaeus and also has potent antineoplastic activity.


acrivastine

A member of the class of pyridines that is (pyridin-2-yl)acrylic acid substituted at position 6 by a [(1E)-1-(4-methylphenyl)-3-(pyrrolidin-1-yl)prop-1-en-1-yl group. It is a non-sedating antihistamine used for treatment of hayfever, urticaria, and rhinitis.


adapalene

A naphthoic acid that is CD437 in which the phenolic hydroxy group has been converted to its methyl ether.


adenosine

A ribonucleoside composed of a molecule of adenine attached to a ribofuranose moiety via a beta-N(9)-glycosidic bond.


adinazolam

A triazolo[4,3-a][1,4]benzodiazepine having a dimethylaminomethyl group at the 1-position, a phenyl group at the 6-position and a chloro substituent at the 8-position.


salbutamol

A member of the class of phenylethanolamines that is 4-(2-amino-1-hydroxyethyl)-2-(hydroxymethyl)phenol having a tert-butyl group attached to the nirogen atom. It acts as a beta-adrenergic agonist used in the treatment of asthma and chronic obstructive pulmonary disease (COPD).


alclofenac

An aromatic ether in which the ether oxygen links an allyl group to the 4-position of (3-chlorophenyl)acetic acid.A non-steroidal anti-inflammatory drug, it was withdrawn from the UK market in 1979 due to concerns with its association with vasculitis and rash.


alendronate

A 1,1-bis(phosphonic acid) that is methanebis(phosphonic acid) in which the two methylene hydrogens are replaced by hydroxy and 3-aminopropyl groups.


alfentanil

A member of the class of piperidines that is piperidine having a 2-(4-ethyl-5-oxo-4,5-dihydro-1H-tetrazol-1-yl)ethyl group at the 1-position as well as N-phenylpropanamido- and methoxymethyl groups at the 4-position.


aliskiren

A monomethoxybenzene compound having a 3-methoxypropoxy group at the 2-position and a multi-substituted branched alkyl substituent at the 4-position.


allopurinol

A bicyclic structure comprising a pyrazole ring fused to a hydroxy-substituted pyrimidine ring.


almotriptan

An indole compound having a 2-(dimethylamino)ethyl group at the 3-position and a (pyrrolidin-1-ylsulfonyl)methyl group at the 5-position.


alosetron

A pyrido[4,3-b]indole compound having a 5-methyl-1H-imidazol-4-ylmethyl group at the 2-position.


alfacalcidol

A member of the class of D3 vitamins that is calciol in which the hydrogen at the 1alpha position is replaced by a hydroxy group. It is an active metabolite of cholecalciferol, which performs important functions in regulation of the calcium balance and the bone metabolism.


alprazolam

A member of the class of triazolobenzodiazepines that is 4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine carrying methyl, phenyl and chloro substituents at positions 1, 6 and 8 respectively. Alprazolam is only found in individuals that have taken this drug.


alprenolol

A secondary alcohol that is propan-2-ol substituted by a 2-allylphenoxy group at position 1 and an isopropylamino group at position 3. It is a beta-adrenergic antagonist used as a antihypertensive, anti-arrhythmia and a sympatholytic agent.


amantadine

A member of the class of  adamantanes that is used as an antiviral and  antiparkinson drug.


ambenonium

A symmetrical oxalamide-based bis-quaternary ammonium ion having ethyl and 2-chlorobenzyl groups attached to the nitrogens.


amiloride

A member of the class of pyrazines resulting from the formal monoacylation of guanidine with the carboxy group of 3,5-diamino-6-chloropyrazine-2-carboxylic acid.


6-aminocaproic acid

An epsilon-amino acid comprising hexanoic acid carrying an amino substituent at position C-6. Used to control postoperative bleeding, and to treat overdose effects of the thrombolytic agents streptokinase and tissue plasminogen activator.


aminoglutethimide

A dicarboximide that is a six-membered cyclic compound having ethyl and 4-aminophenyl substituents at the 3-position.


amiodarone

A member of the class of 1-benzofurans that is 1-benzofuran substituted by a butyl group at position 2 and a 4-[2-(diethylamino)ethoxy]-3,5-diiodobenzoyl group at position 3. It is a  cardiovascular drug used for the treatment of cardiac dysrhythmias.


amitriptyline

An organic tricyclic compound that is 10,11-dihydro-5H-dibenzo[a,d][7]annulene substituted by a 3-(dimethylamino)propylidene group at position 5.


amlexanox

A pyridochromene-derived monocarboxylic acid having an amino substituent at the 2-position, an oxo substituent at the 5-position and an isopropyl substituent at the 7-position.


amlodipine

A fully substituted dialkyl 1,4-dihydropyridine-3,5-dicarboxylate derivative, which is used for the treatment of hypertension, chronic stable angina and confirmed or suspected vasospastic angina.


amoxapine

A dibenzooxazepine compound having a chloro substituent at the 2-position and a piperazin-1-yl group at the 11-position.


amphetamine

A primary amine that is isopropylamine in which a hydrogen attached to one of the methyl groups has been replaced by a phenyl group.


inamrinone

A 3,4'-bipyridine substituted at positions 5 and 6 by an amino group and a keto function respectively. A pyridine phosphodiesterase 3 inhibitor, it is a drug that may improve the prognosis in patients with congestive heart failure.


anagrelide

A 1,5-dihydroimidazo[2,1-]quinazoline having an oxo substituent at the 2-position and chloro substituents at the 6- and 7-positions.


anastrozole

A 1,2,4-triazole compound having a 3,5-bis(2-cyano-2-propyl)benzyl group at the 1-position.


anileridine

A piperidinecarboxylate ester that is the ethyl ester of isonipecotic acid in which the hydrogen alpha- to the carboxyl group is substituted by a phenyl group, and the hydrogen attached to the nitrogen is substituted by a 2-(4-aminophenyl)ethyl group.


anisindione

A cyclic beta-diketone consisting of indane-1,3-dione having a 4-methoxyphenyl substituent at the 4-position.


antazoline

A member of the class of imidazolines that is 2-aminomethyl-2-imidazoline in which the exocyclic amino hydrogens are replaced by benzyl and phenyl groups. Antazoline is only found in individuals that have taken the drug.


apraclonidine

An imidazoline that is 2-amino 4,5-dihydro-1H-imidazoline in which one of the exocyclic amino hydrogens has been replaced by a 4-amino-2,6-dichlorophenyl group.


aprepitant

A morpholine-based antiemetic, which is or the prevention of acute and delayed nausea and vomiting associated with initial and repeat courses of highly emetogenic cancer chemotherapy. Aprepitant is a selective high-affinity antagonist of human substance P/neurokinin 1 (NK1) receptors.


aripiprazole

An N-arylpiperazine that is piperazine substituted by a 4-[(2-oxo-1,2,3,4-tetrahydroquinolin-7-yl)oxy]butyl group at position 1 and by a 2,3-dichlorophenyl group at position 4. It is an antipsychotic drug used for the treatment of Schizophrenia, and other mood disorders.


ARSENIC TRIOXIDE

An arsenic oxide in which arsenic and oxygen atoms are present in the ratio 2:3.


atenolol

An ethanolamine compound having a (4-carbamoylmethylphenoxy)methyl group at the 1-position and an N-isopropyl substituent.


atomoxetine

A  secondary amino compound having methyl and 3-(2-methylphenoxy)-3-phenylpropan-1-yl substituents.


atorvastatin

A dihydroxy monocarboxylic acid that is a member of the drug class known as statins, used primarily for lowering blood cholesterol and for preventing cardiovascular diseases.


atracurium

A diester compound consisting of pentane-1,5-diol with both hydroxyls bearing 3-[1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-3,4-dihydroisoquinolinium-2(1H)-yl]propanoyl groups.


azatadine

A benzo[5,6]cyclohepta[1,2-b]pyridine having a 1-methylpiperidin-4-ylidene group at the 11-position.


azelastine

A phthalazine compound having an oxo substituent at the 1-position, a 1-methylazepan-4-yl group at the 2-position and a 4-chlorobenzyl substituent at the 4-position.


baclofen

An amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of baclofen.


balsalazide

A monohydroxybenzoic acid consisting of 5-aminosalicylic acid (mesalazine) linked to 4-aminobenzoyl-beta-alanine via an azo bond.


beclometasone dipropionate

A steroid ester comprising beclomethasone having propionyl groups at the 17- and 21-positions.


benazepril

A benzazepine that is benazeprilat in which the carboxy group of the 2-amino-4-phenylbutanoic acid moiety has been converted to the corresponding ethyl ester. It is used (generally as its hydrochloride salt) as a prodrug for the angiotensin-converting enzyme inhibitor benazeprilat in the treatment of hypertension and heart failure.


bendroflumethiazide

A sulfonamide consisting of 7-sulfamoyl-3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide in which the hydrogen at position 6 is substituted by a trifluoromethyl group and that at position 3 is substituted by a benzyl group.


benoxaprofen

A monocarboxylic acid that is propionic acid substituted at position 2 by a 2-(4-chlorophenyl)-1,3-benzoxazol-5-yl group. It was used as a non-steroidal anti-inflammatory drug until 1982 when it was withdrawn from the market due to adverse side-effects including liver necrosis, photosensitivity, and carcinogenicity in animals.


diphenidol

A tertiary alcohol that is butan-1-ol substituted by two phenyl groups at position 1 and a piperidin-1-yl group at position 4.


benzphetamine

Dextroamphetamine in which the the hydrogens attached to the amino group are substituted by a methyl and a benzyl group. A sympathomimetic agent with properties similar to dextroamphetamine, it is used as its hydrochloride salt in the treatment of obesity.


benzthiazide

7-Sulfamoyl-1,2,4-benzothiadiazine 1,1-dioxide in which the hydrogen at position 6 is substituted by chlorine and that at position 3 is substituted by a benzylsulfanylmethyl group. A diuretic, it is used to treat hypertension and edema.


benzatropine

Tropane in which a hydrogen at position 3 is substituted by a diphenylmethoxy group (endo-isomer). An acetylcholine receptor antagonist, it is used (particularly as its methanesulphonate salt) in the treatment of Parkinson's disease, and to reduce parkinsonism and akathisia side effects of antipsychotic treatments.


bepotastine

An ether that is (S)-(4-chlorophenyl)(pyridin-2-yl)methanol in which the hydroxyl hydrogen is substituted by a 1-(3-carboxypropyl)piperidin-4-yl group. A topical, selective and non-sedating histamine (H1) receptor antagonist used (as its benzenesulfonate salt) for treatment of itching associated with allergic conjunctivitis.


bepridil

A tertiary amine in which the substituents on nitrogen are benzyl, phenyl and 3-(2-methylpropoxy)-2-(pyrrolidin-1-yl)propyl.


betamethasone dipropionate

A steroid ester that is betamethasone in which the hydroxy hydrogens at positions 17 and 21 are replaced by propanoyl groups. It is used in combination with calcipotriene hydrate, a synthetic vitamin D analogue, for the topical treatment of plaque psoriasis in adult patients.


betamethasone valerate

A steroid ester that is betamethasone in which the hydroxy group at the 17alpha position has been converted to the corresponding pentanoate ester.


betaxolol

A  propanolamine that is 3-aminopropane-1,2-diol in which the hydrogen of the primary hydoxy is substituted by a 4-[2-(cyclopropylmethoxy)ethyl]phenyl group and one of the hydrogens attached to the amino group is substituted by isopropyl. It is a selective  beta1-receptor blocker and is used in the treatment of glaucoma as well as hypertension, arrhythmias, and coronary heart disease. It is also used to reduce non-fatal cardiac events in patients with heart failure.


betazole

Pyrazole in which a hydrogen adjacent to one of the nitrogen atoms is substituted by a 2-aminoethyl group. It is a histamine H2-receptor agonist used clinically to test gastric secretory function.


bethanechol

The carbamic acid ester of 2-methylcholine. A slowly hydrolysed muscarinic agonist with no nicotinic effects, it is used as its chloride salt to increase smooth muscle tone, as in the gastrointestinal tract following abdominal surgery, treatment of gastro-oesophageal reflux disease, and as an alternative to catheterisation in the treatment of non-obstructive urinary retention.


bezafibrate

A monocarboxylic acid amide obtained by the formal condensation of the carboxy group of 4-chlorobenzoic acid with the amino group of 2-[4-(2-aminoethyl)phenoxy]-2-methylpropanoic acid. Benafibrate is used for the treatment of hyperlipidaemia.


bicalutamide

A member of the class of (trifluoromethyl)benzenes that is 4-amino-2-(trifluoromethyl)benzonitrile in which one of the amino hydrogens is substituted by a 3-[(4-fluorophenyl)sulfonyl]-2-hydroxy-2-methylpropanoyl group.


biperiden

A member of the class of piperidines that is N-propylpiperidine in which the methyl hydrogens have been replaced by hydroxy, phenyl, and 5-norbornen-2-yl groups. A muscarinic antagonist affecting both the central and peripheral nervous systems, it is used in the treatment of all forms of Parkinson's disease.


bitolterol

The di-4-toluate ester of (+-)-N-tert-butylnoradrenaline (colterol). A pro-drug for colterol, a beta2-adrenergic receptor agonist, bitolterol is used as its methanesulfonate salt for relief of bronchospasm in conditions such as asthma, chronic bronchitis and emphysema.


bivalirudin

A synthetic peptide of 20 amino acids, comprising D-Phe, Pro, Arg, Pro, Gly, Gly, Gly, Gly, Asn, Gly, Asp, Phe, Glu, Glu, Ile, Pro, Glu, Glu, Tyr, and Leu in sequence. A congener of hirudin (a naturally occurring drug found in the saliva of the medicinal leech), it a specific and reversible inhibitor of thrombin, and is used as an anticoagulant.


bortezomib

L-Phenylalaninamide substituted at the amide nitrogen by a 1-(dihydroxyboranyl)-3-methylbutyl group and at N(alpha) by a pyrazin-2-ylcarbonyl group. It is a dipeptidyl boronic acid that reversibly inhibits the 26S proteasome.


bretylium

A quaternary ammonium cation having 2-bromobenzyl, ethyl and two methyl groups attached to the nitrogen. It blocks noradrenaline release from the peripheral sympathetic nervous system, and is used in emergency medicine, cardiology, and other specialties for the acute management of ventricular tachycardia and ventricular fibrillation.


bromfenac

Amfenac in which the the hydrogen at the 4 position of the benzoyl group is substituted by bromine. It is used for the management of ocular pain and treatment of postoperative inflammation in patients who have undergone cataract extraction. It was withdrawn from the US market in 1998, following concerns over off-label abuse and hepatic failure.


BROMODIPHENHYDRAMINE HYDROCHLORIDE

The hydrochloride salt of bromazine. An antihistamine with antimicrobial properties, it is used in the control of cutaneous allergies.


brompheniramine

Pheniramine in which the hydrogen at position 4 of the phenyl substituent is substituted by bromine. A histamine H1 receptor antagonist, brompheniramine is used (commonly as its maleate salt) for the symptomatic relief of allergic conditions, including rhinitis and conjunctivitis.


buclizine

An N-alkylpiperazine carrying (4-chlorophenyl)(phenyl)methyl and 4-tert-butylbenzyl groups.


budesonide

A glucocorticoid steroid having a highly oxygenated pregna-1,4-diene structure. It is used mainly in the treatment of asthma and non-infectious rhinitis and for treatment and prevention of nasal polyposis.


bumetanide

A member of the class of benzoic acids that is 4-phenoxybenzoic acid in which the hydrogens ortho to the phenoxy group are substituted by butylamino and sulfamoyl groups. Bumetanide is a diuretic, and is used for treatment of oedema associated with congestive heart failure, hepatic and renal disease.


bunolol

A cyclic ketone that is 3,4-dihydronaphthalen-1-one substituted at position 5 by a 3-(tert-butylamino)-2-hydroxypropoxy group (the S-enantiomer). A non-selective beta-adrenergic antagonist used (as its hydrochloride salt) for treatment of glaucoma.


bupivacaine

A racemate composed of equimolar amounts of dextrobupivacaine and levobupivacaine. Used (in the form of its hydrochloride hydrate) as a local anaesthetic.


buprenorphine

A morphinane alkaloid that is 7,8-dihydromorphine 6-O-methyl ether in which positions 6 and 14 are joined by a -CH2CH2- bridge, one of the hydrogens of the N-methyl group is substituted by cyclopropyl, and a hydrogen at position 7 is substituted by a 2-hydroxy-3,3-dimethylbutan-2-yl group. It is highly effective for the treatment of opioid use disorder and is also increasingly being used in the treatment of chronic pain.


bupropion

An aromatic ketone that is propiophenone carrying a tert-butylamino group at position 2 and a chloro substituent at position 3 on the phenyl ring.


buspirone

An azaspiro compound that is 8-azaspiro[4.5]decane-7,9-dione substituted at the nitrogen atom by a 4-(piperazin-1-yl)butyl group which in turn is substituted by a pyrimidin-2-yl group at the N(4) position.


butalbital

A member of the class of  barbiturates that is barbituric acid in which the hydrogens at position 5 are substituted by an allyl group and an isobutyl group. Frequently combined with other medicines, such as aspirin, paracetamol and codeine, it is used for treatment of pain and headache.


butorphanol

Levorphanol in which a hydrogen at position 14 of the morphinan skeleton is substituted by hydroxy and one of the hydrogens of the N-methyl group is substituted by cyclopropyl. A semi-synthetic opioid agonist-antagonist analgesic, it is used as its (S,S)-tartaric acid salt for relief or moderate to severe pain.


cabergoline

An N-acylurea that is (8R)-ergoline-8-carboxamide in which the hydrogen attached to the piperidine nitrogen (position 6) is substituted by an allyl group and the hydrogens attached to the carboxamide nitrogen are substituted by a 3-(dimethylamino)propyl group and an N-ethylcarbamoyl group. A dopamine D2 receptor agonist, cabergoline is used in the management of Parkinson's disease and of disorders associated with hyperprolactinaemia.


caffeine

A trimethylxanthine in which the three methyl groups are located at positions 1, 3, and 7. A purine alkaloid that occurs naturally in tea and coffee.


calcifediol

A hydroxycalciol that is calciol in which the hydrogen at position 25 has been replaced by a hydroxy group. A prehormone resulting from the oxidation of calciol in the liver, it is further hydroxylated in the kidney to give calcitriol, the active form of vitamin D3.


calcipotriol

A seco-cholestane that is 26,27-cyclo-9,10-secocholesta-5,7,10,22-tetraene carrying additional hydroxy substituents at positions 1, 3 and 24. It is used (as its hydrate) in combination with betamethasone dipropionate, a corticosteroid, for the topical treatment of plaque psoriasis in adult patients.


1,25-dihydroxyvitamin D3

A hydroxycalciol that is calcidiol in which the pro-S hydrogen of calcidiol is replaced by a hydroxy group. It is the active form of vitamin D3, produced fom calciol via hydoxylation in the liver to form calcidiol, which is subsequently oxidised in the kidney to give calcitriol.


camostat

A benzoate ester resulting from the formal condensation of the carboxy group of 4-guanidinobenzoic acid with the hydroxy group of 2-(dimethylamino)-2-oxoethyl (4-hydroxyphenyl)acetate. It is a potent inhibitor of the human transmembrane protease serine 2 (TMPRSS2) and its mesylate salt is currently under investigation for its effectiveness in COVID-19 patients.


capecitabine

A carbamate ester that is cytidine in which the hydrogen at position 5 is replaced by fluorine and in which the amino group attached to position 4 is converted into its N-(penyloxy)carbonyl derivative. Capecitabine is a antineoplastic agent used in the treatment of cancers.


captopril

A L-proline derivative in which L-proline is substituted on nitrogen with a (2S)-2-methyl-3-sulfanylpropanoyl group. It is used as an anti-hypertensive ACE inhibitor drug.


carbamazepine

A dibenzoazepine that is 5H-dibenzo[b,f]azepine carrying a carbamoyl substituent at the azepine nitrogen, used as an anticonvulsant.


CARBIDOPA

The hydrate of 3-(3,4-dihydroxyphenyl)propanoic acid in which the hydrogens alpha- to the carboxyl group are substituted by hydrazinyl and methyl groups (S-configuration). Carbidopa is a dopa decarboxylase inhibitor, so prevents conversion of levodopa to dopamine. It has no antiparkinson activity by itself, but is used in the management of Parkinson's disease to reduce peripheral adverse effects of levodopa.


carbinoxamine

An organochlorine compound that is 2-(4-chlorobenzyl)pyridine in which one of the benzylic hydrogens is substituted by 2-(dimethylamino)ethoxy group. It is an ethanolamine-type antihistamine, used as its maleate salt for treating hay fever, as well as mild cases of Parkinson's disease.


carboprost

Prostaglandin F2alpha in which the hydrogen at position 15 is substituted by methyl (S configuration). It is used as an abortifacient agent that is effective in both the first and second trimesters of pregnancy.


carmustine

A member of the class of N-nitrosoureas that is 1,3-bis(2-chloroethyl)urea in which one of the nitrogens is substituted by a nitroso group.


carphenazine

A member of the class of phenothiazines that is 10H-phenothiazine which carries a propanoyl group at position 2 and a 3-[4-(2-hydroxyethyl)piperazin-1-yl]propyl group at position N-10. It is an antipsychotic drug that is used for the treatment of chronic schizophrenia.


carprofen

Propanoic acid in which one of the methylene hydrogens is substituted by a 6-chloro-9H-carbazol-2-yl group. A non-steroidal anti-inflammatory drug, it is no longer used in human medicine but is still used for treatment of arthritis in elderly dogs.


carvedilol

A member of the class of carbazoles that is an adrenergic antagonist with non-selective beta- and alpha-1 receptor blocking properties which helps in the management of congestive heart failure.


celecoxib

A member of the class of pyrazoles that is 1H-pyrazole which is substituted at positions 1, 3 and 5 by 4-sulfamoylphenyl, trifluoromethyl and p-tolyl groups, respectively. A cyclooxygenase-2 inhibitor, it is used in the treatment of arthritis.


cerivastatin

(3R,5S)-3,5-dihydroxyhept-6-enoic acid in which the (7E)-hydrogen is substituted by a 4-(4-fluorophenyl)-2,6-diisopropyl-5-(methoxymethyl)pyridin-3-yl group. Formerly used (as its sodium salt) to lower cholesterol and prevent cardiovascular disease, it was withdrawn from the market worldwide in 2001 following reports of a severe form of muscle toxicity.


ceruletide

A decapeptide comprising 5-oxoprolyl, glutamyl, aspartyl, O-sulfotyrosyl, threonyl, glycyl, tryptopyl, methionyl, aspartyl and phenylalaninamide residues in sequence. Found in the skins of certain Australian amphibians, it is an analogue of the gastrointestinal peptide hormone cholecystokinin and stimulates gastric, biliary, and pancreatic secretion. It is used in cases of paralysis of the intestine (paralytic ileus) and as a diagnostic aid in pancreatic malfunction.


cetirizine

A member of the class of piperazines that is piperazine in which the hydrogens attached to nitrogen are replaced by a (4-chlorophenyl)(phenyl)methyl and a 2-(carboxymethoxy)ethyl group respectively.


cetrorelix

A synthetic ten-membered oligopeptide comprising N-acetyl-3-(naphthalen-2-yl)-D-alanyl, 4-chloro-D-phenylalanyl, 3-(pyridin-3-yl)-D-alanyl, L-seryl, L-tyrosyl, N(5)-carbamoyl-D-ornithyl, L-leucyl, L-arginyl, L-prolyl, and D-alaninamide residues coupled in sequence. A gonadotrophin-releasing hormone (GnRH) antagonist, it is used for treatment of infertility and of hormone-sensitive cancers of the prostate and breast.


chlordiazepoxide

A benzodiazepine that is 3H-1,4-benzodiazepine 4-oxide substituted by a chloro group at position 7, a phenyl group at position 5 and a methylamino group at position 2.


chloroprocaine

Procaine in which one of the hydrogens ortho- to the carboxylic acid group is substituted by chlorine. It is used as its monohydrochloride salt as a local anaesthetic, particularly for oral surgery. It has the advantage over lidocaine of constricting blood vessels, so reducing bleeding.


chlorothiazide

4H-1,2,4-benzothiadiazine 1,1-dioxide in which the hydrogen at position is substituted by chlorine and that at position 7 is substituted by a sulfonamide group. A diuretic, it is used for treatment of oedema and hypertension.


chlorpheniramine

A tertiary amino compound that is propylamine which is substituted at position 3 by a pyridin-2-yl group and a p-chlorophenyl group and in which the hydrogens attached to the nitrogen are replaced by methyl groups. A histamine H1 antagonist, it is used to relieve the symptoms of hay fever, rhinitis, urticaria, and asthma.


chlorpromazine

A substituted phenothiazine in which the ring nitrogen at position 10 is attached to C-3 of an N,N-dimethylpropanamine moiety.


chlorprothixene

A chlorprothixene in which the double bond adopts a (Z)-configuration.


cilastatin

The thioether resulting from the formal oxidative coupling of the thiol group of L-cysteine with the 7-position of (2Z)-2-({[(1S)-2,2-dimethylcyclopropyl]carbonyl}amino)hept-2-enoic acid. It is an inhibitor of dehydropeptidase I (membrane dipeptidase, 3.4.13.19), an enzyme found in the brush border of renal tubes and responsible for degrading the antibiotic imipenem. Cilastatin is therefore administered (as the sodium salt) with  imipenem to prolong the antibacterial effect of the latter by preventing its renal metabolism to inactive and potentially nephrotoxic products. Cilastatin also acts as a leukotriene D4 dipeptidase inhibitor, preventing the metabolism of leukotriene D4 to leukotriene E4.


cilostazol

A lactam that is 3,4-dihydroquinolin-2(1H)-one in which the hydrogen at position 6 is substituted by a 4-(1-cyclohexyl-1H-tetrazol-5-yl)butoxy group.


cimetidine

A member of the class of  guanidines that consists of guanidine carrying a methyl substituent at position 1, a cyano group at position 2 and a 2-{[(5-methyl-1H-imidazol-4-yl)methyl]sulfanyl}ethyl group at position 3. It is a  H2-receptor antagonist that inhibits the production of acid in stomach.


cinacalcet

A secondary amino compound that is (1R)-1-(naphthalen-1-yl)ethanamine in which one of the hydrogens attached to the nitrogen is substituted by a 3-[3-(trifluoromethyl)phenyl]propyl group.


cisatracurium

A diester that is the (1R,1'R,2R,2'R)-diastereoisomer of atracurium, a quaternary ammonium ion  consisting of pentane-1,5-diol with both hydroxy functions bearing 3-[1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-3,4-dihydroisoquinolinium-2(1H)-yl]propanoyl groups.  The active species in the skeletal muscle relaxant cisatracurium besylate.


citalopram

A racemate comprising equimolar amounts of (R)-citalopram and its enantiomer,  escitalopram. It is used as an antidepressant, although only escitalopram is active.


clemastine

2-[(2R)-1-Methylpyrrolidin-2-yl]ethanol in which the hydrogen of the hydroxy group is substituted by a 1-(4-chlorophenyl)-1-phenylethyl group (R configuration). An antihistamine with antimuscarinic and moderate sedative properties, it is used as its fumarate salt for the symptomatic relief of allergic conditions such as rhinitis, urticaria, conjunctivitis and in pruritic (severe itching) skin conditions.


clobazam

7-Chloro-1H-1,5-benzodiazepine-2,4(3H,5H)-dione in which the hydrogen attached to the nitrogen at position 1 is substituted by a methyl group, whilst that attached to the other nitrogen is substituted by a phenyl group. It is used for the short-term management of acute anxiety and as an adjunct in the treatment of epilepsy in association with other antiepileptics.


clofarabine

A purine nucleoside analogue consisting of a 6-amino-2-chloropurin-9-yl group attached to the 1beta position of 2'-deoxy-2'-fluoro-D-arabinofuranose. It is metabolized intracellularly to the active 5'-triphosphate metabolite, which inhibits DNA synthesisis and so stops the growth of cancer cells. Clofarabine is used as an antimetabolite antineoplastic agent in the treatment of relapsed or refractory acute lymphoblastic leukaemia.


clofibrate

The ethyl ester of clofibric acid.


clomipramine

A dibenzoazepine that is 10,11-dihydro-5H-dibenzo[b,f]azepine which is substituted by chlorine at position 3 and in which the hydrogen attached to the nitrogen is replaced by a 3-(dimethylamino)propyl group. One of the more sedating tricyclic antidepressants, it is used as the hydrochloride salt for the treatment of depression as well as obsessive-compulsive disorder and phobias.


clonazepam

1,3-Dihydro-2H-1,4-benzodiazepin-2-one in which the hydrogens at positions 5 and 7 are substituted by 2-chlorophenyl and nitro groups, respectively. It is used in the treatment of all types of epilepsy and seizures, as well as myoclonus and associated abnormal movements, and panic disorders. However, its use can be limited by the development of tolerance and by sedation.


clonidine

A clonidine that is 4,5-dihydro-1H-imidazol-2-amine in which one of the amino hydrogens is replaced by a 2,6-dichlorophenyl group.


clopidogrel

A thienopyridine that is 4,5,6,7-tetrahydrothieno[3,2-c]pyridine in which the hydrogen attached to the nitrogen is replaced by an o-chlorobenzyl group, the methylene hydrogen of which is replaced by a  methoxycarbonyl group (the S enantiomer). A P2Y12 receptor antagonist, it is used to inhibit blood clots and prevent heart attacks.


clorazepate

A 1,4-benzodiazepinone in which the oxo group is at position 2, and which is substituted at positions 3, 5, and 7 by carboxy, phenyl and chloro groups, respectively.


clozapine

A benzodiazepine that is 5H-dibenzo[b,e][1,4]diazepine substituted by a chloro group at position 8 and a 4-methylpiperazin-1-yl group at position 11. It is a second generation antipsychotic used in the treatment of psychiatric disorders like  schizophrenia.


cocaine

A tropane alkaloid obtained from leaves of the South American shrub Erythroxylon coca.


codeine

A  morphinane alkaloid found in the opium poppy, Papaver somniferum var. album; has analgesic, anti-tussive and anti-diarrhoeal properties.


conivaptan

The amide resulting from the formal condensation of 4-[(biphenyl-2-ylcarbonyl)amino]benzoic acid with the benzazepine nitrogen of 2-methyl-1,4,5,6-tetrahydroimidazo[4,5-d][1]benzazepine. It is an antagonist for two of the three types of arginine vasopressin (AVP) receptors, V1a and V2. It is used as its hydrochloride salt for the treatment of hyponatraemia (low blood sodium levels) caused by syndrome of inappropriate antidiuretic hormone (SIADH).


cyclizine

An N-alkylpiperazine in which one nitrogen of the piperazine ring is substituted by a methyl group, while the other is substituted by a diphenylmethyl group.


cyclobenzaprine

5-Methylidene-5H-dibenzo[a,d]cycloheptene in which one of the hydrogens of the methylidene group is substituted by a 2-(dimethylamino)ethyl group. A centrally acting skeletal muscle relaxant, it is used as its hydrochloride salt in the symptomatic treatment of painful muscle spasm.


cyclopentolate

A carboxylic ester resulting from the formal condensation of (1-hydroxycyclopentyl)(phenyl)acetic acid with N,N-dimethylethanolamine. A tertiary amine antimuscarinic with actions similar to atropine, it is used as its hydrochloride salt to produce mydriasis (excessive dilation of the pupil) and cycloplegia (paralysis  of the ciliary muscle of the eye) for opthalmic diagnostic procedures. It acts more quickly than atropine and has a shorter duration of action.


cyclosporin A

A cyclic nonribosomal peptide of eleven amino acids; an immunosuppressant drug widely used in post-allogeneic organ transplant to reduce the activity of the patient's immune system, and therefore the risk of organ rejection. Also causes reversible inhibition of immunocompetent lymphocytes in the G0- and G1-phase of the cell cycle.


cyclothiazide

3,4-Dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide substituted at positions 3, 5 and 6 by a 2-norbornen-5-yl group, chlorine, and a sulfonamide group, respectively. A thiazide diuretic, it has been used in the management of hypertension and oedema.


cycrimine

A member of the class of piperidines that is 3-(piperidin-1-yl)propan-1-ol in which one of the hydrogen atoms at the 1-position is substituted by cyclopentyl, and the other is substituted by phenyl. A central anticholinergic, it is used as its hydrochloride salt in the management and treatment of Parkinson's disease.


cyproheptadine

The product resulting from the formal oxidative coupling of position 5 of 5H-dibenzo[a,d]cycloheptene with position 4 of 1-methylpiperidine resulting in the formation of a double bond between the two fragments. It is a sedating antihistamine with antimuscarinic and calcium-channel blocking actions. It is used (particularly as the hydrochloride sesquihydrate) for the relief of allergic conditions including rhinitis, conjunctivitis due to inhalant allergens and foods, urticaria and angioedema, and in pruritic skin disorders. Unlike other antihistamines, it is also a seratonin receptor antagonist, making it useful in conditions such as vascular headache and anorexia.


cyproterone acetate

A steroid ester resulting from the formal condensation of the carboxy group of acetic acid with the 17-hydroxy group of cyproterone. It is an antiandrogenic drug which has recently been recognized to promote the occurrence and growth of intracranial meningiomas.


cytarabine

A pyrimidine nucleoside in which cytosine is attached to D-arabinofuranose via a beta-N(1)-glycosidic bond. Used mainly in the treatment of leukaemia, especially acute non-lymphoblastic leukaemia, cytarabine is an antimetabolite antineoplastic agent that inhibits the synthesis of DNA. It also has antiviral and immunosuppressant properties.


dabigatran etexilate

An aromatic amide obtained by formal condensation of the carboxy group of 2-{[(4-{N'-[(hexyloxy)carbonyl]carbamimidoyl}phenyl)amino]methyl}-1-methyl-1H-benzimidazole-5-carboxylic acid with the secondary amino group of ethyl N-pyridin-2-yl-beta-alaninate. A prodrug for dabigatran, a thrombin inhibitor and anticoagulant which is used for the prevention of stroke and systemic embolism.


darifenacin

2-[(3S)-1-Ethylpyrrolidin-3-yl]-2,2-diphenylacetamide in which one of the hydrogens at the 2-position of the ethyl group is substituted by a  2,3-dihydro-1-benzofuran-5-yl group. It is a selective antagonist for the M3 muscarinic acetylcholine receptor, which is primarily responsible for bladder muscle contractions, and is used as the hydrobromide salt in the management of urinary incontinence.


dasatinib

An aminopyrimidine that is 2-methylpyrimidine which is substituted at position 4 by the primary amino group of 2-amino-1,3-thiazole-5-carboxylic acid and at position 6 by a 4-(2-hydroxyethyl)piperazin-1-yl group, and in which the carboxylic acid group has been formally condensed with 2-chloro-6-methylaniline to afford the corresponding amide. A multi-targeted kinase inhibitor, it is used, particularly as the monohydrate, for the treatment of chronic, accelerated, or myeloid or lymphoid blast phase chronic myeloid leukemia. Note that the name 'dasatinib' is used to refer to the monohydrate (USAN) as well as to anhydrous dasatinib (INN).


daunorubicin

A natural product found in Actinomadura roseola.


decamethonium

A quaternary ammonium ion that is a depolarising muscle relaxant whose structure comprises a decane-1,10-diamine core in which each amino group carries three methyl substituents.


demecarium

The bis(quaternary ammonium) dication obtained by N,N'-dimethylation of the N,N'-bis[3-(dimethylamino)phenyl carbamate] derivative of 2,13-diazatetradecane.


desipramine

A dibenzoazepine consisting of 10,11-dihydro-5H-dibenzo[b,f]azepine substituted on nitrogen with a 3-(methylamino)propyl group.


deslanoside

A cardenolide glycoside that is lanatoside C with the acetoxy group replaced by a hydroxy group.


desloratadine

Loratadine in which the ethoxycarbonyl group attached to the piperidine ring is replaced by hydrogen. The major metabolite of loratidine, desloratadine is an  antihistamine which is used for the symptomatic relief of allergic conditions including rhinitis and chronic urticaria. It does not readily enter the central nervous system, so does not cause drowsiness.


desoximetasone

Dexamethasone in which the hydroxy group at the 17alpha position is substituted by hydrogen. A synthetic corticosteroid with glucocorticoid activity, it is used as an anti-inflammatory and anti-pruritic in the treatment of various skin disorders, including skin allergies and psoriasis.


dexamethasone

A fluorinated steroid that is 9-fluoropregna-1,4-diene substituted by hydroxy groups at positions 11, 17 and 21, a methyl group at position 16 and oxo groups at positions 3 and 20. It is a synthetic member of the class of  glucocorticoids.


dexbrompheniramine

The (pharmacologically active) (S)-(+)-enantiomer of brompheniramine. A histamine H1 receptor antagonist, it is used (commonly as its maleate salt) for the symptomatic relief of allergic conditions, including rhinitis and conjunctivitis.


dexketoprofen

A monocarboxylic acid that is (S)-hydratropic acid substituted at position 3 on the phenyl ring by a benzoyl group. A cyclooxygenase inhibitor, it is used to relieve short-term pain, such as muscular pain, dental pain and dysmenorrhoea.


dexmethylphenidate

A methyl phenyl(piperidin-2-yl)acetate in which both stereocentres have R configuration.  It is the active enantiomer in the racemic drug methylphenidate.


dexamfetamine

A 1-phenylpropan-2-amine that has S configuration.


dextrothyroxine

The D-enantiomer of thyroxine.


dezocine

(7S,8S)-7-Amino-8-methyl-5,6,7,8-tetrahydronaphthalen-2-ol in which the hydrogen at position 8 and one of the hydrogens at position 6 are substituted by each end of a tetramethylene bridge. A synthetic opioid analgesic, it has mixed opiod agonist and antagonist properties. Although it is used for pain management, it can produce opioid withdrawal syndrome in patients already dependent on other opioids, and its clinical application is limited by side effects such as dizziness.


diazepam

A 1,4-benzodiazepinone that is 1,3-dihydro-2H-1,4-benzodiazepin-2-one substituted by a chloro group at position 7, a methyl group at position 1 and a phenyl group at position 5.


diazoxide

A benzothiadiazine that is the S,S-dioxide of 2H-1,2,4-benzothiadiazine which is substituted at position 3 by a methyl group and at position 7 by chlorine. A peripheral vasodilator, it increases the concentration of glucose in the plasma and inhibits the secretion of insulin by the beta- cells of the pancreas. It is used orally in the management of intractable hypoglycaemia and intravenously in the management of hypertensive emergencies.


dibucaine

A monocarboxylic acid amide that is the 2-(diethylamino)ethyl amide of 2-butoxyquinoline-4-carboxylic acid. One of the most potent and toxic of the long-acting local anesthetics, its parenteral use was restricted to spinal anesthesia. It is now generally only used (usually as the hydrochloride) in creams and ointments and in suppositories for temporary relief of pain and itching associated with skin and anorectal conditions.


diclofenamide

A sulfonamide that is benzene-1,3-disulfonamide in which the hydrogens at positions 4 and 5 are substituted by chlorine. An oral carbonic anhydrase inhibitor, it partially suppresses the secretion (inflow) of aqueous humor in the eye and so reduces intraocular pressure. It is used for the treatment of glaucoma.


diclofenac

A monocarboxylic acid consisting of phenylacetic acid having a (2,6-dichlorophenyl)amino group at the 2-position.


dicumarol

A hydroxycoumarin that is methane in which two hydrogens have each been substituted by a 4-hydroxycoumarin-3-yl group. Related to warfarin, it has been used as an anticoagulant.


dicyclomine

The ester resulting from the formal condensation of 1-cyclohexylcyclohexanecarboxylic acid with 2-(diethylamino)ethanol. An anticholinergic, it is used as the hydrochloride to treat or prevent spasm in the muscles of the gastrointestinal tract, particularly that associated with irritable bowel syndrome.


diethylpropion

An  aromatic ketone that is propiophenone in which one of the hydrogens alpha- to the carbonyl is substituted by a diethylamino group. A central stimulant and indirect-acting sympathomimetic, it is an appetite depressant and is used as the hydrochloride as an anoretic in the short term management of obesity.


diethylstilbestrol

An olefinic compound that is trans-hex-3-ene in which the hydrogens at positions 3 and 4 have been replaced by p-hydroxyphenyl groups.


difenoxin

A piperidinemonocarboxylic acid that is 4-phenylpiperidine-4-carboxylic acid in which the hydrogen attached to the nitrogen atom is substituted by a 3-cyano-3,3-diphenylpropyl group.


diflunisal

An organofluorine compound comprising salicylic acid having a 2,4-difluorophenyl group at the 5-position.


digitoxin

A cardenolide glycoside in which the 3beta-hydroxy group of digitoxigenin carries a 2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl trisaccharide chain.


digoxin

A  cardenolide glycoside that is digitoxin beta-hydroxylated at C-12. A cardiac glycoside extracted from the foxglove plant, Digitalis lanata, it is used to control ventricular rate in atrial fibrillation and in the management of congestive heart failure with atrial fibrillation, but the margin between toxic and therapeutic doses is small.