• atidarsagen autotemcel
• atogepant monohydrate
• atomoxetine hydrochloride
• atorvastatin
• atorvastatin calcium trihydrate
• atosiban
• atosiban acetate
• atovacuone
• atropine sulfate
• atropine sulfate monohydrate
• attenuated bcg
• attenuated mumps virus
• attenuated varicella-zoster virus oka strain
• avacopan
• avalglucosidase alfa
• avanafil
• avapritinib
• avatrombopag maleate
• avelumab
• avibactam sodium
• axicabtagen ciloleucel
• axitinib
• azacitidine
• azathioprine
• azelaic acid
• azelastine hydrochloride
• azithromycin
• azithromycin dihydrate
• azithromycin monohydrate
• aztreonam