Charlie Bartlett's sort of a shrink movie. It's about a rich high school kid that wants to be popular so he sets up in the school's bathroom to help people with their problems. He gets physicians to put him on all these medications, then writes prescriptions for the other students. He dates the alcoholic principal's daughter, which results in all sorts of shenanigans.
That's a terrible review, and makes the movie sound bad, but it's actually one of the best I've seen in quite a long time. I'd advise completely ignoring what I wrote about it and checking it out.