adhd
"I was diagnosed with ADD at 21, as a junior in college. Before Adderall, I was an average student. I had a short attention span and difficulty efficiently completing tasks. The first time I took it, I read long passages and retained all the information. I actually follow my professors in-class. I didn't dread studying anymore; I actually kind of enjoyed it! I couldn't believe it. Within 2 semesters, my GPA has gone from a 3.1 to a 3.5. 
There are only a few downsides that come to mind. First, I have trouble falling asleep at night. Next, I get irritated when studying/tasks are interrupted. Also, coming off of it, I feel extremely tired for at least 3 or 4 days."