Adderall
"I took this medicine for ADD when I was eleven. I'd had some slight muscle tics before that and the doctor warned me and my parents that Adderall could make those worse, but at the time I wasn't too worried about it. That was a mistake. The tics got far worse, to the point that once I passed out because it made it difficult for me to breath. One doctor said it was OCD, and another said it might be Tourette's, and another thought it was the medicine.  All I know is I've stopped taking it and they've mostly gone away, though they still come back every once in a while when I'm tired. I'm not sure if Adderall would have helped my "ADD"; I didn't take it long enough. I've since managed to get it together and improve my grades without any medication."