According to data from the 2003–2011 National Survey of Children’s Health (NCHS), 3.5 million children (69% of children with current ADHD as reported by parents) were taking medication for ADHD (CDC, 2014).
Teens & Young Adults
Data from the Medical Expenditure Panel Survey which included 62,699 teens (aged 12–17 years) and young adults (aged 18–23 years) during years 2003–2012, found rates of ADHD medication use increased for both teens and young adults. The medications included amphetamines, methylphenidates and atomoxetine. Use of these medications increased for teens from 4.2% in 2003–2004 to 6% in 2011–2012. For young adults, medication use increased from 1.2% in 2003–2004 to 2.6% in 2011–2012 (Johansen, 2015).
A web article that examines ADHD medication usage for adults can be found on this site.