I'm was on 100mg of Seroquel at first and I gained a little weight, then they changed it to 200 mg after I had my baby and I've gained 15 pounds on top of what I weighed while pregnant. They changed me to Seroquel 200 mg nightly and 300 mg twice daily of Lithium and I've gained 20 pounds in 3 weeks, i go to the gym 3-4 times a week and I cut out soda and what not and I'm gaining too much weight. I am now 245 pounds. over 90 pounds over my pre pregnancy weight. I just want to find something that helps me sleep at night and won't cause me to gain alot of weight.