You don't say how old the child is, but apparenly he is in school. My son had been on Ritilin but it is a short acting drug. It was like a roller coaster going from the great focus while the ritilin was in effect to the rebound crash and silliness when the med wore off. Has the child been put on any of the longer lasting medications, such as Adderall or Concerta? It seems that some meds will make kids angrier and more agressive. If that is the case, then a different med needs to be tried. Also, keep pushing for continued diagnostic work. My son had an ADD diagnosis for years. I always felt something else was going on, but had problems getting anyone to take me seriously. Recently, the School Psyc FINALLY sat down with my son...Guess what, he also has a form of autism...PDD-NOS. Hopefully now I'll get the school services my son needs... The important part of this, is do what I wish I had done.. go with your gut instincts, and push hard if you don't think you are getting the right answers. Good luck.