Diarrhea can often be stopped by using over-the-counter (OTC) medications such as loperamide (Imodium) or bismuth subsalicylate (Pepto-Bismol). Remember, though, that diarrhea caused by a virus or ...

Some common supplements that cause diarrhea include vitamin C, zinc, and fish oil. Here's why and how to prevent diarrhea from vitamins and supplements.