title: St. John's wort may diminish methylphenidate's efficacy in treating patients suffering from attention deficit hyperactivity disorder.
authors.forename: Helmut
authors.initials: H
authors.lastname: Niederhofer
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity / Q000188:drug therapy*; D004347:Drug Interactions; D006801:Humans; D020902:Hypericum; D008774:Methylphenidate / Q000627:therapeutic use*; D008954:Models, Biological; D008517:Phytotherapy
chemical_list: D008774:Methylphenidate