An anti-diarrhoeal drug (or anti-diarrheal drug in American English) is any medication which provides symptomatic relief for diarrhoea. ==Types== ...
Antidiarrhetic ... 1. Having the property of opposing or correcting diarrhoea. ... 2. An agent having such action. ... (05 Mar 2000) ... 
Antidiarrhoeal medicine is used to treat diarrhoea. For example, dicyclomine.