loperamide

A synthetic antidiarrheal agent of the opiate class (trademark Imodium) 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.