Apparently, some of the push for more medication comes from policy makers who believe that early medication may prevent later drug and alcohol abuse. However, recent studies found that the link between ADHD and drug abuse remains regardless of the treatment a child receives.
The article's authors call for doctors and teachers to take a second look at using medication as the default treatment for ADHD. Unfortunately, I don't think schools will stop referring kids for medication anytime soon. In the current environment, where hardcore academics begin in kindergarten and many children receive only one recess a day, we're going to see more and more children diagnosed with ADHD. In fact, I'd argue that corralling children in a classroom for 7 hours followed by 3 hours of daycare and several hours of homework is a system designed to induce ADHD, even in children whose brains were developing normally.