| 1. Amoxicillin | 2. Amphetamine |
| 3. Amphotericin B | 4. Ampicillin |
| 5. Amprenavir | 6. Amsacrine |
| 7. Anagrelide | 8. Anastrozole |
| 9. Anidulafungin | 10. Anileridine |
| 11. Anisindione | 12. Anisotropine Methylbromide |
| 13. Apomorphine | 14. Apraclonidine |
| 15. Aprepitant | 16. Arbutamine |
| 17. Ardeparin | 18. Argatroban |
| 19. Aripiprazole | 20. Arsenic trioxide |
| 21. Aspirin | 22. Astemizole |
| 23. Atazanavir | 24. Atenolol |
| 25. Atomoxetine | 26. Atorvastatin |
| 27. Atovaquone | 28. Atracurium |
| 29. Atropine | 30. Auranofin |
| 31. Azacitidine | 32. Azatadine |
| 33. Azathioprine | 34. Azelaic Acid |
| 35. Azelastine | 36. Azithromycin |
| 37. Azlocillin | 38. Aztreonam |
|
|