"my son started concerta 18mg a little over a year ago at 9 yrs old. what a positive change for him!! his self-esteem was back and he was social and smiling all the time. made new friends easily and enjoyed things other than video games and tv. lately, we have noticed a change...his concentration is not as good, he has trouble getting organized at school and likes to stay in his room for hours at a time. he reminds me of the kid he was before medication. april 1st, we have an apt with the pediatrician and i am assuming we will up the dose to 27mg and hopefully find our happy boy again! we have also tried biphentin, which did not work for us. concerta has been a life saver and i hope it will continue to be with the proper dosage :)"