My docs have put me on Flagyl numerous times. I used to have some parasitic issues. It can also help relieve symptoms of IBS in some people with diarrhea. It's not really a picnic taking it (like Keri said, DO NOT drink any alcohol while you're taking it or for 3-4 days afterwards); it can cause headaches and a funny taste in your mouth and occasionally nausea. But, I found that it helped my symptoms every time I took a 10-day course of it, usually for about
3-4 months. That was worth 10 days of headaches for me.