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ADHD medication includes Ritalin and Adderall. Both have stimulant/amphetamine like effects to those without ADHD. You can see the window for abuse and addiction here is pretty huge.

Children misdiagnosed with ADHD can get hooked on this stuff (I don't have a source for that, but its what I've heard).

More commonly, college/highschool students can get them pretty easily to cram for an exam or finish an assignment in one night, or at least that's what they're told by movies and TV (but I'm told by a friend that it really is effective in getting a lot of work done in a small timeframe).