Hello, I have taken stimulants such as Ritalin and other similar drugs for years due to ADHD, about 8 years far as I can tell, and when I stopped about 4 years ago, I developed a twitch. Its like a shiver that comes over your entire body and your just forced to move. My sister took the same medication for the same amount of time and does the same thing, and so do some of her and my friends who took stimulants for long periods of time. I would really like to confirm my theroy so please reply. Post edited at 3:05 pm on Aug. 15, 2008 by Xerxes1121