| Oxymetholone | 434-07-1 | Androgens | 2 |
| P-Aminophenol | | Analgesics | 2 |
| P-Aminophenol | | Analgesics | 2 |
| PRL-8-53 | 1432368-62-9 | | 2 |
| Palmitoyl Tetrapeptide | 7-221227-05-0 | | 2 |
| Palmitoylethanolamide | 544-31-0 | Analgesics | 2 |
| Parecoxib Sodium intermediates | 37928-17-9 | | 2 |
| Paromomycin | 7542-37-2 | Aminoglycosides | 2 |
| Pasireotide | 396091-73-9 | Somatostatin Analogs | 2 |
| Pazufloxacin | 127045-41-4 | Quinolones | 2 |
| Pentosan Polysulfate Sodium | | Mucopolysaccharide polysulfates | 2 |
| Pepsin | 64963-01-5 | | 2 |
| Perospirone | 150915-41-6 | Atypical antipsychotics | 2 |
| Phenibut | 1078-21-3 | Central Nervous System Agents | 2 |
| Phenindione | 83-12-5 | Vitamins | 2 |
| Phenyl salicylate | 23327-57-3 | NSAIDs | 2 |
| Phloroglucinol | 108-73-6 | | 2 |
| Phosphatidyl serine | 1446756-47-3 | | 2 |
| Pinaverium Bromide | 60719-84-8 | | 2 |
| Piretanide | 55837-27-9 | Diuretics | 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 |