Prozac, was a godsend for me. I was on it for almost 9 years and then it seemed to not work for me anymore, but NO it absolutely did not put any weight on me. But in saying that if it helps you to overcome the disorder the doctor put you on it for, a little weight gain should not be a big deal. Get yourself better first, and then deal with weight gain, if by some strange phenon, you actually do gain any.