Over the past 20 years, mental disabilities have overtaken physical disabilities as the leading limitation on children's activities. Today, attention deficit hyperactivity disorder is three times more likely than asthma to disable an American child. An often difficult question for parents is whether to put their child with ADHD on either Ritalin or Adderall, the most common drug treatments for hyper and impulsive behaviors. Increasingly, the answer has been yes. In 2011, according to the U.S. Centers for Disease Control and Prevention, more than 6 percent of American children ages 4 to 17 were taking ADHD drugs.