Diarrhea is one of the side effects of Topamax. This is an off-label use of this drug supported by a few small studies funded mostly by drug companies. Consumer's Reports has a good article about it, pros, cons and research findings. They seem to think the potential side effects limit its usefulness in all but the most serious of cases. I wanted my psydoc to put me on it, but the more I read about it the less I like the idea. I hope it works for all who try it. After all the reading I've done today, I'm thinking since my main motivation is weight loss, not overcoming binge behavior, I should probably try ed treatment, therapy, and/or self-help first.