| Pine | | Herbal remedies | 1 |
| Pink peppercorn | | Herbal remedies | 1 |
| Pipamperone | 1893-33-0 | Atypical antipsychotics | 1 |
| Pipazethate | 2167-85-3 | | 1 |
| Piperazine Citrate | 14396-16-8 | | 1 |
| Piperazine Hexahydrate | | | 1 |
| Piperine | 94-62-2 | Enzyme Replacements/modifiers | 1 |
| Pipobroman | 54-91-1 | Cytostatic antibiotics | 1 |
| Pipoxolan | 23744-24-3 | Antipsychotics | 1 |
| Piribedil | 3605-01-4 | Other central nervous system agents | 1 |
| Piroctone olamine | 68890-66-4 | Antifungals | 1 |
| Pitofenone Hydrochloride | 136-59-6 | | 1 |
| Pitz colombo radix | | Herbal remedies | 1 |
| Pitz condurango cortex | | Herbal remedies | 1 |
| Pitz cynosbati fructus | | Herbal remedies | 1 |
| Pivalamide | 754-10-9 | Intermediates | 1 |
| Pivampicillin | 33817-20-8 | Penicillins | 1 |
| Pixantrone | 144510-96-3 | | 1 |
| Plantain herb | | Herbal remedies | 1 |
| Podophyllin | 9000-55-9 | | 1 |
| Policresulen | 25322-68-3 | | 1 |
| Poloxamer 188 | | Surfactants | 1 |
| Poloxamer 407 | | Excipients | 1 |
| Poly Lactic-co-Glycolic Acid (PLGA) | | Excipients | 1 |
| Polygala Senega Extracts and Infusions | | | 1 |
| Polygeline | 9015-56-9 | Blood and plasma products | 1 |
| Polyhexamethylene biguanide hydrochloride 20% solution | 32289-58-0 | Disinfectants | 1 |
| Polyhexanide | 28757-47-3 | Disinfectants | 1 |
| Polylysine | 101418-00-2 | | 1 |
| Polyquaternium 51 | 25104-18-1 | | 1 |
| Polysaccharide Iron Complex (PIC) | 9004-66-4 | | 1 |
| Polysulfated Glycosaminoglycans | | | 1 |
| Polyvinylpolypyrrolidone (PVPP) | 25249-54-1 | | 1 |
| Polyvinylpyrrolidone | 9003-39-8 | | 1 |
| Ponazuril | 61477-40-5 | | 1 |
| Ponesimod | 854107-55-4 | Anticancer drugs | 1 |
| Porcine Gelatin Tannate | 9000-70-8 | Antidiarrheals | 1 |
| Potassium DL-Aspartate Hemihydrate | | | 1 |
| Potassium chlorate | 3811-04-9 | Disinfectants | 1 |
| Potassium gluconate | 299-27-4 | Electrolytes | 1 |