ADHD
"I have been taking amphetamine for about four and a half years.  The first time I took it was when I was a senior in college and it helped in so many ways.  I could finally concentrate in class and while doing homework. The notes I took in class were copious, I remembered materials I studied, and I wrote my complete thorough essays for tests and research papers.  I wish I took it in high school, my GPA would have been at least a half a point higher."