ADHD
"I&#039;m 16, and have been taking Concerta for about a year now. It works well and really helps me focus, but I do have a lack of appetite and trouble sleeping. Neither of those are really bad though. My 2 biggest complaints are first that I feel less creative while I&#039;m on it and second, when I don&#039;t take it now my concentration is horrible, and I get less done than before I started taking it."