loperamide

noun

lo·​per·​a·​mide lō-ˈper-ə-ˌmīd 

variants also loperamide hydrochloride

: a synthetic antidiarrheal agent that slows intestinal peristalsis and is taken orally in the form of its hydrochloride C₂₉H₃₃ClN₂O₂·HCl to control acute nonspecific diarrhea or chronic diarrhea associated with inflammatory bowel disease or to reduce fecal volume discharged from ileostomies

Note: Loperamide is marketed under the trademark Imodium.