| Trade name |
Active ingredients |
Pharmaceutical company |
|
Oin | Hyoscyamine | Unidentified Pharmaceutical Company |
| Oji Malachite Green | Malachite Green | Unidentified Pharmaceutical Company |
| Okasa-Mascul | Testosterone | Unidentified Pharmaceutical Company |
| Okodon | Pemoline | Unidentified Pharmaceutical Company |
| Oksaren | Oxolinic Acid | Unidentified Pharmaceutical Company |
| Oktadin | Guanethidine | Unidentified Pharmaceutical Company |
| Oktatensin | Guanethidine | Unidentified Pharmaceutical Company |
| Oktatenzin | Guanethidine | Unidentified Pharmaceutical Company |
| Oktedrin | Amphetamine | Unidentified Pharmaceutical Company |
| Okultin M | 2-Methyl-4-Chlorophenoxyacetic Acid | Unidentified Pharmaceutical Company |