| ATC Codes | Pharmacological Classification | Pharmacological Classification/DDD |
|---|---|---|
| R | RESPIRATORY SYSTEM | 呼吸系统 |
| R05 | COUGH AND COLD PREPARATIONS | 咳嗽和感冒用药 |
| R05D | COUGH SUPPRESSANTS, EXCL. COMBINATIONS WITH EXPECTORANTS | 止咳药，与祛痰药的复方除外 |
| R05DA | Opium alkaloids and derivatives | 阿片生物碱及其衍生物类 |
| R05DB | Other cough suppressants | 其它止咳药 |