noun
laxative; purgative; cathartic
Medical term for a substance that promotes bowel movements. 瀉剤 (しゃざい) is a common synonym.
See also: 瀉剤
便秘の治療には、まず瀉薬が処方されることが多い。
For treating constipation, a laxative is often prescribed first.
この漢方薬には穏やかな瀉薬作用がある。
This herbal medicine has a mild laxative effect.