This suspension is mixed with Kaolin and Pectin. Furazolidone is used to treat bacterial and protozoal infections. It works by killing bacteria and protozoa (tiny, one-celled animals). Some protozoa are parasites that can cause many different kinds of infections in the body. Furazolidone is taken by mouth. It works inside the intestinal tract to treat cholera, colitis, and/or diarrhea caused by bacteria, and giardiasis. furazolidone is sometimes given with other medicines for bacterial infections. Furazolidone may cause some serious side effects when taken with certain foods, beverages, or other medicines. Check with your health care professional for a list of products that should be avoided.