narcolepsy
"Along with narcolepsy, I've also been diagnosed with ADHD. I have been taking dexedrine for the last 4 years. At first it was 5mg tablets which worked for a couple months. As soon as my dose was increased to 10mg spansules a day, my life has been so much easier since then. I can actually concentrate on one thing without wanting to quit in the middle and take a nap. Many side effects including dry mouth almost every day, heart pounding, loss of appetite leading to weight loss, muscles twitching, and severe tiredness if I suddenly stop taking it."