Of 8,000 people whose medication use fluctuated over three years, the study found that men were 32 percent less likely and women were 41 percent less likely to have criminal convictions while on medication for ADHD.
A large study suggests that people with serious attention deficit hyperactivity disorder (ADHD) are less likely to commit crimes when taking medication.
The study, published in The New England Journal of Medicine, examined records of 25,000 people in Sweden to see if those with ADHD had fewer criminal convictions when taking medication than when they were not.
Of 8,000 people whose medication use fluctuated over three years, men were 32 percent less likely and women were 41 percent less likely to have criminal convictions while on medication. Patients were primarily young adults, many with a history of hospitalization. Crimes included assault, drug offenses and homicide, and less serious crimes. Medication varied, but many took stimulants such as Ritalin.
“The study adds a lot,” said Dr. Gabrielle Carlson, director of child and adolescent psychiatry at Stony Brook University medical school, who was not involved in the study. “Cutting the crime rate, that’s not trivial. Maybe it will get some help for people in jail. It gives people who were on the fence maybe a little more confidence in this treatment.”
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Studies suggest that people with ADHD are more likely to commit crimes. And while people, especially boys, are often prescribed medication as children, they often resist taking it as teenagers. Studies have not shown that medication has long-term effects on symptoms.
Dr. Paul Lichtenstein, a study author and a professor at Karolinska Institute in Sweden, cautioned against concluding that everyone with ADHD should be continuously medicated.
“There are pros and cons to medication,” he said. But “in young adults, the age where criminality is most common, you should consider medication because it is more harmful for these people to be involved in criminal activities. Also for prisoners and people who have left prison.”
Researchers said that correlations between medication and decreased crime held up regardless of the type of medication or crime and the presence of other disorders. They tried to determine if patients stopped treatment because of criminal convictions but found that treatment itself appeared linked to fewer crimes.
Among psychiatric experts, when, and sometimes whether, to prescribe ADHD medication is debated. Drugs do not work for everyone, and side effects can include jittery feelings and suppressed appetite and growth.
William Pelham, director of the Center for Children and Families at Florida International University, said nondrug therapies such as behavioral modification worked as well as medication in the short run. He said the study did not prove that medication caused less criminality, and because most subjects were seriously ill adults, the results were irrelevant for most U.S. children.
Jason Fletcher, an associate professor at the Yale School of Public Health, said that despite some weaknesses, the study provided a “very suggestive piece of evidence” supporting medication.
“Because crime is so expensive, if you can reduce it, even by half of what they’re saying, you might still say this is really effective medication.”
He did wonder if medication is reducing crime or “making better criminals,” who avoid arrest.
Lichtenstein deemed that unlikely.
“I don’t think you would commit the crime,” he said, “and then just not get caught.”