The European debut of a pill to treat children with attention deficit hyperactivity disorder faces a major hurdle: convincing people the condition exists.
Shire Plc, the world’s biggest seller of ADHD drugs, has been rolling out the pill, Vyvanse, in eight countries while discussing the prevalence of the illness with doctors at psychiatry conferences around Europe. More than 90 percent of the Dublin-based company’s sales of ADHD drugs come from the U.S., where the illness is diagnosed about 25 times more frequently than in the U.K.
