I tried to switch from Risperdal to Abilify over the past week because Risperdal caused me to gain a ton of weight. I started to have a whole bunch of noise in my head driving me insane and extreme paranoia. I also started having a ton of violent and perverted thoughts towards everyone around me. Guess I am stuck on Risperdal. That really sucks because I could tell the Abilify would of helped me lose the weight, it shrunk my appetite a lot while on it. Hours after I went back to Risperdal I felt hungry again.