| Omega-3-acid ethyl esters 60 | | Lipid-lowering agents | 1 |
| Ondansetron Compound A | 119812-29-2 | 5HT3 antagonists | 1 |
| Orange petals | | Herbal remedies | 1 |
| Orforglipron Hemicalcium Hydrate | 2212021-26-4 | | 1 |
| Orris root | | Herbal remedies | 1 |
| Orthodichlorobenzene | 95-50-1 | Disinfectants | 1 |
| Osimertinib intermediates | 142-25-6 | | 1 |
| Oteseconazole | 1340593-59-0 | Antimycotics | 1 |
| Otilonium | 105360-89-2 | Antispasmodics | 1 |
| Oxalate salt of Benzyl (2S,5R)-5-((Benzyloxy)amino)piperidine
-2-carboxylate | 1171080-45-7 | Intermediates | 1 |
| Oxerutin | 17673-25-5 | | 1 |
| Oxfendazole | 53716-50-0 | Anti-infective Agents | 1 |
| Oxibendazole | 20559-55-1 | | 1 |
| Oxolamine Citrate | 83886-84-6 | Antitussives | 1 |
| Oxolinic Acid | 14698-29-4 | Quinolones | 1 |
| Oxymel of squill | | | 1 |
| Oxytetracycline Hydrochloride | 2058-46-0 | | 1 |
| Ozagrel sodium | 189224-26-8 | | 1 |
| Ozenoxacin Intermediates | | | 1 |
| Pacritinib | 937272-79-2 | Enzyme Replacements/modifiers | 1 |
| Paize | | Antispasmodics | 1 |
| Palbociclib intermediates | 733039-20-8 | | 1 |
| Pale coneflower root | 84929-31-7 | Herbal remedies | 1 |
| Palladium Chloride | 2864-50-8 | | 1 |
| Palm tree leaves | | Herbal remedies | 1 |
| Palmitic Acid | 57-10-3 | Dermatics | 1 |
| Palmitoyl Oligopeptide | 5987-82-6 | | 1 |
| Palmitoyl Tripeptide | 1-147732-56-7 | | 1 |
| Panax Ginseng dry extract 10% | 50647-08-0 | Herbal remedies | 1 |
| Pancrelipase | 53608-75-6 | Pancreatic enzymes | 1 |
| Pantethine | 16816-67-4 | Dietary supplements | 1 |
| Papain | 9001-73-4 | Other substances | 1 |
| Papaya leaf | | Herbal remedies | 1 |
| Para Iodo Nitrobenzene | 636-98-6 | | 1 |
| Paradisi seed | | Herbal remedies | 1 |
| Parecoxib Sodium | 198470-85-8 | | 1 |
| Paregoric (Camphorated opium tincture) | | | 1 |
| Parietariae herba | | Herbal remedies | 1 |
| p-Dimethylaminophenole Hydrochloride | | Analgesics | 1 |
| pancreatin | 8049-47-6 | | 1 |