What can you do to stop diarrhea?

Loperamide. From a basic, over the counter anti-diarrheal perspective, loperamide worlks great. It is important however, to diagnose the real source of the diarrhea, from a simple food intolerance or viral infection to something more severe.
Imodium (loperamide) Imodium (loperamide) is an excellent over the counter treatment for diarrhea. Most diarrhea will resolve in 1-2 days without treatment. For chronic diarrhea (lasting more than a week), bloody diarrhea, or diarrhea associated with high fever, vomiting and weight loss you should see your doctor.