All individuals in ATC
| Label | Id | Description |
|---|---|---|
| opium | N02AA02 | |
| opium | A07DA02 | |
| opium alkaloids and derivative combination cough suppressants | R05DA20 | |
| opium alkaloids with morphine | R05DA05 | |
| opium derivatives and expectorants | R05FA02 | |
| opium derivatives and mucolytics | R05FA01 | |
| oprelvekin | L03AC02 | |
| orciprenaline | R03AB03 | |
| orciprenaline | R03CB03 | |
| orciprenaline, combinations | R03CB53 | |
| ordinary salt combinations | A02AD01 | |
| ordinary salt combinations and antiflatulents | A02AF02 | |
| organic nitrates in combination | C01DA20 | |
| organic nitrates in combination with psycholeptics | C01DA70 | |
| organo-heparinoid | C05BA01 | |
| orgotein | M01AX14 | |
| oritavancin | J01XA05 | |
| orlistat | A08AB01 | |
| ormeloxifene | G03XC04 | |
| ornidazole | J01XD03 |