adhd
"I had been on Concerta in high school for questionable ADHD diagnosis, and it had a VERY minimal benefit. So minimal that after 2 school years it was determined my problem was probably more attributable to being "smarter than your average bear" and I just was not being challenged in my non-honours and non-dual credit classes. 
Made it through Uni and my doctorate degrees OK by overloading my schedule and surviving on coffee and caffeine tabs, taking 18 hr semesters instead of the rec'd 12-15 hrs.
Fast forward to a few yrs later, I have been on Adderall for about 4 mo, titrating to the perfect dose of 2×5mg at 8am & 5mg at noon. Was switched to modafinil B/C my anorexia nervosa and I can't wake up, get out of bed, finish reading an email. Hate it!"