| ATC Codes | Pharmacological Classification | Pharmacological Classification/DDD |
|---|---|---|
| R | RESPIRATORY SYSTEM | 呼吸系统 |
| R07 | OTHER RESPIRATORY SYSTEM PRODUCTS | 其它呼吸系统用药 |
| R07A | OTHER RESPIRATORY SYSTEM PRODUCTS | 其它呼吸系统用药 |
| R07AX | Other respiratory system products | 其它呼吸系统药物 |
| R07AX01 | nitric oxide | 氧化氮 |