Twenty-five people died suddenly and another 54 suffered serious cardiovascular problems after taking drugs to treat attention deficit hyperactivity disorder between 1999 and 2003, according to a report from the US government’s Food and Drug Administration. The report says that children accounted for 19 of the deaths and 26 of the cases of nonfatal cardiovascular problems, including heart attack, stroke, hypertension, palpitations and arrhythmia.