[A]fter longer-term analysis, the report's co-author, Professor William Pelham of the University of Buffalo, said: "I think that we exaggerated the beneficial impact of medication in the first study.
"We had thought that children medicated longer would have better outcomes. That didn't happen to be the case.
"There's no indication that medication's better than nothing in the long run." Prof Pelham said there were "no beneficial effects" of medication and the impact was seemingly negative instead.
Source: Drugs for ADHD 'not the answer'