A new review finds that while children account for almost 60 percent of those with five common medical conditions, only 12 percent of clinical trials of drugs for those conditions examined their effects on pediatric patients. Some drugs taken by adults work the opposite way in kids, explained Albert Wertheimer, a professor of pharmacoeconomics at Temple. "Drugs for [attention-deficit disorder] are stimulants that people take to stay up for a test, but when used in kids, they settle them down," Wertheimer noted.