| Nazwa handlowa | Nazwa międzynarodowa |
| Oculosan | NAPHAZOLINI NITRAS + |
| Oflodinex | OFLOXACINUM |
| Oftan-Timolol | TIMOLOLUM |
| Oftensin | TIMOLOLUM |
| Oksazepam | OXAZEPAMUM |
| Olbetam | ACIPIMOXUM |
| Olfen | DICLOFENACUM |
| Olicard retard 40 | ISOSORBIDI MONONITRA |
| Olicard retard 60 | ISOSORBIDI MONONITRA |
| Ophticor H | HYDROCORTISONUM |
| Opticrom | NATRII CROMOGLICAS |
| Oracef | CEFALEXINUM |
| Ortanol | OMEPRAZOLUM |
| Osalen | ACIDUM ALENDRONICUM |
| Ospen | PHENOXYMETHYLPENICIL |
| Ostelavit | COLECALCIFEROLUM |
| Ostenil | ACIDUM ALENDRONICUM |
| Oxazepam | OXAZEPAMUM |
| Oxycardil 60 | DILTIAZEMI HYDROCHLO |
| Oxycardil 180 | DILTIAZEMI HYDROCHLO |
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