| PRL-8-53 | 1432368-62-9 | | 2 |
| Pitolisant | 63547-13-7 | | 2 |
| Plecanatide | 467426-54-6 | | 2 |
| Pneumocandin B0 | 135575-42-7 | | 2 |
| Polyquaternium-1 | | Excipients | 2 |
| Polysorbate 60 | | Excipients | 2 |
| Ponatinib | 943319-70-8 | Protein kinase inhibitors | 2 |
| Potassium Guaiacolsulfonate | | Cough medicines | 2 |
| Potassium acetate | 127-08-2 | Electrolytes | 2 |
| Potato starch | 9005-25-8 | Excipients | 2 |
| Povidone K-12 | | Excipients | 2 |
| Pralatrexate | 146464-95-1 | Antimetabolites | 2 |
| Pralidoxime | 6735-59-7 | Antidotes | 2 |
| Pramiracetam | 68497-62-1 | Other central nervous system agents | 2 |
| Pramoxine Hydrochloride | 637-58-1 | | 2 |
| Prednisolone Hemisuccinate | | Corticosteroids | 2 |
| Probucol | 23288-49-5 | Lipid-lowering agents | 2 |
| Protirelin | 24305-27-9 | Hypothalamic hormones | 2 |
| Pyrazine hydrochloride | 762240-92-6 | | 2 |
| Pyridoxal | 66-72-8 | Vitamins | 2 |
| Pyridoxal Phosphate | 54-47-7 | Vitamins | 2 |
| Pyroglutamate | 149-87-1 | Nervous System Agents | 2 |
| Quinacrine | 83-89-6 | Antiprotozoics | 2 |
| Racemethionine | 59-51-8 | Other calcium Channel Blockers | 2 |
| Recuronium Br | 119302-91-9 | Neuromuscular blocking agents | 2 |
| Relugolix | 737789-87-6 | Gonadotrophic | 2 |
| Retapamulin | 224452-66-8 | Macrolides | 2 |
| Revefenacin intermediates | 107201-33-2 | | 2 |
| Ribociclib Succinate | | | 2 |
| Riboflavin-5-phosphate Sodium | 2319-84-8 | | 2 |
| Ribonuclease | | Antineoplastics | 2 |
| Ribose | 50-69-1 | Cardiac stimulants | 2 |
| Ropivacaine Hydrochloride | 132112-35-7 | | 2 |
| Roxatidine acetate | 78628-28-1 | H2 antagonists | 2 |
| Ruxolitinib Phosphate | 941678-49-5 | | 2 |
| Ruxolitinib Phosphate Intermediates | | | 2 |
| S-Carboxymethyl-L-cysteine | 2387-59-9 | | 2 |
| Safinamide Mesylate | 202825-46-5 | | 2 |
| Sapropterin | 62989-33-7 | Central Nervous System Agents | 2 |
| Saquinavir | 127779-20-8 | Anti-HIV | 2 |