I gained 30 kg (about 65 lbs) on Zyprexa, going from a BMI of 16.4 to one of 26.3. While tapering off I lost about 15 kg of that, so now I have a healthy BMI.

I got put on Clozapine and I have no weight gain, even though clozapine is know for its weight gain (maybe even more than Zyprexa).