| 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 |
| N02AJ | Opioids in combination with non-opioid analgesics | 阿片类药物联合非阿片类镇痛药 |
| N02AJ15 | tramadol and other non-opioid analgesics | 曲马多和其他非阿片类镇痛药 |