Furazolidone is a nitrofuran derivative antibiotic with antiprotozoal and antibacterial activity. It targets a wide variety of bacteria, including those responsible for gastrointestinal infections. It has also been used as a DNA cross-linking agent. 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.