Methylphenidate
"My son is 6 and has been on this medication for a week and has shown improvement at school. He has been able to work independently on his work sheets and gets through his work faster. He is very smart but didn't have the focus to complete a task but I have noticed he has loss of appetite and not going to sleep at night which is bothersome to me because he was always such a good eater and sleeper. So might have to look into other medicines."