That's exactly what I gained from Zyprexa in high school. I have no idea how much I was taking though. The weight basically fell off of me when I stopped taking it also. I will never take it again. That said, I will more than likely be starting Clozaril which is a stronger anti-psychotic but the weight gain is the same or worse. I am just praying I don't have that side effect because I've already gained enough on lithium.