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Many Children With ADHD Not Being Treated

Research Contradicts Notion that Children are Overmedicated

August 11, 2006

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In contrast to claims that children are being overmedicated for attention-deficit/hyperactivity disorder (ADHD), a team of researchers at Washington University School of Medicine in St. Louis has found that a high percentage of kids with ADHD are not receiving treatment.

In fact, almost half of the children who might benefit from ADHD drugs were not getting them.

"What we found was somewhat surprising," says Richard D. Todd, M.D., Ph.D., the Blanche F. Ittleson Professor of Psychiatry and professor of genetics. "Only about 58 percent of boys and about 45 percent of girls who had a diagnosis of full-scale ADHD got any medication at all."

Much has been written about the increasing number of children taking drugs for ADHD. One study found that the percentage of elementary school children taking medication for ADHD more than tripled, rising from 0.6 percent in 1975 to 3 percent by 1987. Another study reported that the number of adolescents taking ADHD drugs increased 2.5 fold between 1990 and 1995. And many reports have noted a rapid increase in the U.S. manufacture of the stimulant drug methylphenidate — usually sold under the brand names Ritalin or Concerta.

The researchers studied 1,610 twins between the ages of 7 and 17. Of those, 359 met full criteria for ADHD: 302 boys and 57 girls. The total number of boys in the sample was 1,006, and 604 girls were included.

"From a clinical point of view, this study affirms that for whatever reason, many children who could benefit from treatment are not receiving it," says first author Wendy Reich, Ph.D., research professor of psychiatry in the William Greenleaf Eliot Division of Child Psychiatry.

It's possible those children aren't being identified at schools or pediatrician's offices or that their parents are choosing not to put their children on stimulant medication, according to Reich.

"It may be that mental health professionals need to do a better job of explaining the risks and benefits of treatment," Todd says. "The vast majority of parents whose children were involved in this study reported that their kids improved with medication, and when used properly these drugs have been shown to be very safe."

Todd, who also is the chief of child psychiatry, says among the 1,251 kids in the study who did not have ADHD, some did take stimulant medications, but it was a very small percentage, only 3.6 percent of the boys and 2.6 percent of the girls.

He says, however, that in many cases, there's an understandable reason those children have sought treatment. The study found that most of the children without ADHD who took medication did have some symptoms of ADHD — some hyperactivity or problems with inattention — but not enough symptoms to meet formal diagnostic criteria as defined by the American Psychiatric Association's Diagnostic and Statistical Manual (DSM-IV). The study also found that most of the kids who took medication without an ADHD diagnosis had a twin who did have the disorder.

"These children have what we might call subsyndromal, or mild, forms of ADHD, and they seemed to come from families where other children had full-blown ADHD," Todd explains. "We didn't find that children got these drugs because they had other problems, such as conduct disorder or a learning disability."

Reich says the eventual goal of studying twins is to learn what elements of ADHD are passed down in families. She says some aspects of the disorder are certainly genetic. Others may be related to environmental factors, and studying twins allows the researchers to tease out those influences. Todd says the hope is to identify genes that contribute to the disorder, or rather, the disorders.

"It's becoming clearer that ADHD is not a single problem but a group of disorders that have different causes but similar clinical expressions," he explains. "There also can be lots of reasons why you become diabetic or hypertensive. The end result is high blood sugar or elevated blood pressure, but how that happens can differ greatly from individual to individual. It's the same thing for ADHD."

Todd believes that as genes are identified, it may become possible to intervene in new ways — with psychotherapies, environmental interventions or medications that affect biological pathways that haven't yet been identified. But he says a potential stumbling block in the future, as now, will involve getting children into treatment.

"That's especially true for girls because for whatever reason, less than half of the girls who had ADHD in this sample ever received treatment," Todd says. "As genes are discovered and treatments developed, they won't be able to solve problems unless they are used."

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