preferred_name: AMPHETAMINE ASPARTATE MONOHYDRATE 20 mg / AMPHETAMINE SULFATE 20 mg / DEXTROAMPHETAMINE SULFATE 20 mg / DEXTROAMPHETAMINE SACCHARATE 20 mg ORAL TABLET [DEXTROAMPHETAMINE SACCHARATE, AMPHETAMINE ASPARTATE, DEXTROAMPHETAMINE SULFATE, AND AMPHETAMINE SULFATE]