My son is 9 years old and has been treated for ADHD for the past two years mostly with Concerta. He has always be disruptive in the classroom, but lately he has become more aggressive and the other kids are shying away from him. The school insisted that he see a psychiatrist (the pediatrician has been managing the ADD meds). I switched him from Concerta to Adderall because I heard that Concerta can cause aggressive behavior. Well, the psychiatrist has put him on Risperdal .25 mg twice a day. Does anyone else use this? Does anyone else see alot of aggression? The kid is fine at home but, apparently, a holy terror at school. Suggestions? Thanks. Maggie