Not everyone gains weight. Zyprexa is bad for that but not for everyone, just a lot of people. I didn't gain anything on it although I wasn't on it long because it did absolutely nothing for me (which isn't common I don't think; it's supposed to work very well for most people). My dr said some of the weight gain depends on your weight when you start; people who are at lower weights are at higher risk to gain. I remember thinking it was nice my Seroquel weight was good for something.....