The latest study on Attention-Deficit Hyperactivity Disorder among children revealed that medicines like Ritalin and Concerta are not good for treatments longer than three years.

The study was made by a team of American scientists leading the Multimodal Treatment Study of Children with ADHD (MTA) and has followed the treatment of 600 kids from the U.S. beginning with 1990.

The result of the study will be presented on the BBC Panorama programmed tonight.

"I think that we exaggerated the beneficial impact of medication in the first study," co-author of the study, Dr. William Pelham, of the University of Buffalo told the BBC on Sunday. Moreover, he added: "We had thought that children medicated longer would have better outcomes. That didn't happen to be the case."  

the report also stated that children following a medication with Ritalin and Concerta register “a decrease in their rate of growth,” which means that they did not grow in either height or weight like the other healthy kids.

"In the short run, [medication] will help the child behave better, in the long run it won't. And that information should be made very clear to parents," Dr. Pelham told as a conclusion of the study.

Doctors have already showed their concern for not having other solutions in treating children with ADHD.Dr. Tim Kendal, of the Royal College of Psychiatrists was one of them:

"A generous understanding would be to say that doctors have reached the point where they don't know what else to offer. I hope we will be able to make recommendations that will give people a comprehensive approach to treatment and that will advise about what teachers might be able to do within the classroom when they're trying to deal with kids who have difficult problems of this kind,” he said during a conference press.

New treatment guidelines regarding treatments of this deficiency will be revealed next year.