Amphetamine is not a bad word, much like Nuclear, Fat or Hacker. It's all in how and what it is used for. I have no idea how much Ampetamine is in Crystal Meth or other illegal substances (Google wasn't very helpful with this, I'm sure as always, somebody here on HN knows), but just because something has Amphetamine does not automatically make it a bad thing.
Methamphetamine is sold legally in the US under the name Desoxyn. I've read comments indicating that in double-blind trials, methamphetamine is not distinguishable from other amphetamines (apart from dosage).
Desoxyn is kind of a "drug of last resort" for ADHD. Most of the time Adderall is sufficient, but there are some people who just don't respond to anything else.
