- Abiraterone
- Acamprosate
- Acebrophylline
- Acebutolol
- Aceclofenac
- Acemetacin
- Acetaminophen
- Acetazolamide
- Acetylcysteine
- Acyclovir
- Adiphenine
- Adrenaline
- Afatinib
- Albendazole
- Alfuzosin
- Algestone
- Allopurinol
- Alogliptin
- Alprazolam
- Ambrisentan
- Ambroxol
- Amiloride
- Amiodarone
- Amitriptyline
- Amlodipine
- Amorolfine
- Amoxicillin
- Anagrelide
- Anastrozole
- Antazoline
- Apalutamide
- Apixaban
- Apremilast
- Argatroban
- Aripiprazole
- Artemether
- Ascorbic acid
- Aspartame
- Aspirin
- Atazanavir
- Atenolol
- Atorvastatin
- Atracurium besylate
- Atropine
- Azacitidine
- Azathioprine
- Azelastine
- Azelnidipine
- Azilsartan
- Azithromycin