| ATC Codes | Pharmacological Classification | Pharmacological Classification/DDD |
|---|---|---|
| N | NERVOUS SYSTEM | 神经系统 |
| N02 | ANALGESICS | 镇痛药 |
| N02A | OPIOIDS | 阿片碱类 |
| N02AX | Other opioids | 其它生物碱类 |
| N02AX02 | tramadol | 曲马多 0.3 g 口服 |
| N02AX02 | tramadol | 曲马多 0.3 g 直肠给药 |
| N02AX02 | tramadol | 曲马多 0.3 g 注射 |