I have taken every drug that has been mentioned above. In my opinion they all cause weight gain/stall weight loss. For my bipolar disorder I was taking risperdal/celexa, zyprexa last year and I gained 40 lbs from them. I need to take the medication, but I totally refuse because I am miserable with all this weight, which cancels out the effects of the medication. It's a horribly viscious cycle. Maybe after I lose my 50 lbs I will try it again, this time doing Atkins and see how it goes....