Version July 2025
| Mu |
| Mu1 |
| Supraspinal analgesia |
| Bradycardia |
| Sedation |
| Mu2 |
| Respiratory depression |
| Euphoria |
| Physical dependence |
| Delta |
| Spinal analgesia |
| Respiratory depression |
| Kappa |
| Spinal analgesia |
| Respiratory depression |
| Sedation |
