| Polyoxypropylene 15 Stearyl Ether | | | 0 |
| Polysilicone-15 | 207574-74-1 | Anticancer drugs | 0 |
| Polythiazide | 346-18-9 | | 0 |
| Polyvinyl acetate dispersion | | | 0 |
| Polyvinyl alcohol | 9002-89-5 | Dental and Oral Agents | 0 |
| Ponezumab | 1178862-65-1 | Other substances | 0 |
| Poractant alfa | 129069-19-8 | | 0 |
| Porfimer | 87806-31-3 | | 0 |
| Porfiromycin | 801-52-5 | Anti-infective Agents | 0 |
| Porgaviximab | 1792982-55-8 | Immunomodulators | 0 |
| Porphobilinogen | 487-90-1 | | 0 |
| Poseltinib | 1353552-97-2 | | 0 |
| Posiphen | 116839-68-0 | Enzyme Replacements/modifiers | 0 |
| Posizolid | 252260-06-3 | | 0 |
| Potassium alum | 10043-67-1 | | 0 |
| Potassium aspartate | 7259-25-8 | Other substances | 0 |
| Potassium bitartrate | 868-14-4 | Hormonal Agents | 0 |
| Potassium carbonate | 584-08-7 | Alkalinizing agents | 0 |
| Potassium dichromate | 7778-50-9 | | 0 |
| Potassium glycerophosphate | 1319-69-3 | | 0 |
| Potassium hydrogen DL-aspartate | 923-09-1 | | 0 |
| Potassium iodate | 7758-05-6 | Anti-infective Agents | 0 |
| Potassium lactate | 996-31-6 | Additives | 0 |
| Potassium metabisulfite | 16731-55-8 | Electrolytes | 0 |
| Potassium nitrate | 7757-79-1 | Additives | 0 |
| Potassium perchlorate | 7778-74-7 | Hormonal Agents | 0 |
| Potassium permangante | 7722-64-7 | | 0 |
| Potassium persulfate | 7722-21-1 | | 0 |
| Potassium phosphate, dibasic, trihydrate | 16788-57-1 | | 0 |
| Potassium sodium hydrogen citrate | 55049-48-4 | | 0 |
| Potassium triiodide | 12298-68-9 | Anticoagulants | 0 |
| Pozanicline | 161417-03-4 | | 0 |
| Pozelimab | 2096328-94-6 | | 0 |
| Poziotinib | 1092364-38-9 | Anticancer drugs | 0 |
| Pracinostat | 929016-96-6 | Anticancer drugs | 0 |
| Praconase | 1186547-12-5 | Other substances | 0 |
| Practolol | 6673-35-4 | | 0 |
| Pradefovir | 625095-60-5 | Anti-infective Agents | 0 |
| Pradefovir Mesylate | | | 0 |
| Prademagene zamikeracel | 2088280-15-1 | | 0 |