Concerta and violent behavior

17 year old boy took Adderal for 7 years - got increasingly more violent, hallucinations, paranoia- added other meds to treat these symptoms, hospitalized twice. Taken off all meds and all these symptoms went away (except for the ADD). Recently, started back on 36 mg. Concerta to treat ADD and violent behavior returned after about 2 weeks.

Do a google search for Concerta + violent behavior and you'll see a lot more info about this "hidden danger." How many kids are being put on lots of other psychiatric meds to treat symptoms that were brought on by these stimulants? We'll take the ADD instead.

10yr old stepson has taken it for about a yr. Started at 36mg a day, down to 18mg a day now. The last few weeks he has had a lot of violent behavior towards other kids at school. We aren't sure if it is caused by taking Concerta but, we are in the process of looking into something else.