Yes I'm on risperdal and I have gained weight, but I also have bad eating habits so I'm not sure of the risperdal is to blame. When I used to go to the gym I lost a lot of pounds, but I gained it back since I've been binge eating on sweets a lot and no longer go to the gym. Since it's getting nicer out I will be exercising outdoors so hopefully I can shed some pounds. I'm not overweight, but I used to have abs and lost them so that's kind of sad.