Children taking drugs to control attention deficit hyperactivity disorder appear to be at no greater risk for heart problems than kids not taking ADHD medications, a new study finds. “ADHD medications can increase heart rate and blood pressure, which might be expected to increase the risk of cardiovascular outcomes,” said lead researcher Sean Hennessy, an assistant professor of epidemiology at the University of Pennsylvania School of Medicine in Philadelphia. But this study, comparing ADHD medication users with non-users, found no difference in the rate of heart problems or deaths between the groups, Hennessy said.