| Active principles | Rating | Bibliogr. | Expand | |
|---|---|---|---|---|
| 1 | Morphine Derivatives | 100 | + | |
| 2 | Naloxone | 74 | + | |
| 3 | Benzomorphans | 26 | + | |
| 4 | Dextrorphan | 12 | + | |
| 5 | Etorphine | 9 | + | |
| 6 | Nalbuphine | 5 | + | |
| 7 | Buprenorphine | 5 | + | |
| 8 | Dextromethorphan | 4 | + | |
| 9 | Levorphanol | 4 | + | |
| 10 | Levallorphan | 3 | + | |
| 11 | Butorphanol | 2 | + |