My son took Concerta for several years and I noticed a change in his attitude. He would become so aggresive that he would actually hit myself. The doctor was upset when I told him I was not going to allow my son to take that medication any more. Now we are having problems with his attitude towards his school work. Good luck to you.
Yes, it is possible. While the active ingredient in Concerta is the same as in Ritalin LA, the method of metabolizing the medication differs.