"my son who is now 7 was on adderall xr for about 9 months. it made him more focused but aggressive and hard to get along with others. he&#039;s been on concerta er 18mg for almost 3 weeks at first he was complaining about headaches but his aggression has changed tremendously. he gets along well with his sisters and is able to control himself better. i think i&#039;m going to like concerta."