I have family with ADHD, depending on the pharmacy, its either "amphetamine salt" or occasionally "methamphetamine something" (I forget). Yea, it's a variation of methamphetamine, and disingenuous to say otherwise, as the idea is to keep a specific area of the brain stimulated (it's been a long time since I read up on it).
That's not a criticism of the drug. I've seen the impact first hand for someone who I'm close to. It may be over diagnosed today, but ADHD is a real condition.