http://www.medications.com/effect/view/28503 My 8 year old son was started on Concerta a few months ago, has severe ADHD & Bipolar Disorder Type 2. He has become more agitated, very short fuse with 7 year old brother, hallucinations - visual of a movie thats coming out - kinda like a harry potter but Wed, 28 May 2008 11:03:04 -0400 http://www.medications.com/effect/view/28503?item=8655 Our experience with stimulants has been that they all caused our son to hallucinate, become paranoid, aggessive and violent. It seems that kids that are prone to mood disorders are more likely to experience these side effects. Try taking him off the Conc http://www.medications.com/effect/view/28503?item=8655