title: Diminished effectiveness of methylphenidate on cognitive tasks in attention deficit disorder with hyperactivity.
mesh_terms: D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000188:drug therapy* / Q000523:psychology; D002648:Child; D003071:Cognition / Q000187:drug effects*; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D008774:Methylphenidate / Q000627:therapeutic use*
chemical_list: D008774:Methylphenidate