Zyprexa...not only did I have a severe dystonic reaction to it, but I put on over sixty lbs in under a year on it. Switched to Seroquel, had the same type of reaction and psychiatrist gave up on atypical modern APs for me. That's why I take Haldol now.
It works for me and I've lost eighteen lbs in 3 mos. A rare side effect of Haldol is loss of appetite. I just take a good multivitamin on doctor's orders and hope for the best.
In my case, the weight loss is a good thing, I got up to 200 lbs and with the small weight loss so far, my knees and back are doing a bit better, I just got put on a small dose of Remeron and am curious to see if it stimulates appetite at all.,