Some side effects encountered with these stimulants include personality changes characterized by a state of excitement, confusion, suicidal thoughts, depression or withdrawal, as well as loss of appetite, weight loss, irritability, restlessness, sleeping problems, stomach ache, headache, rapid or irregular heartbeat, elevated blood pressure, and sometimes muscle twitches of the face and other parts of the body, which could lead to Tourette's Syndrome. There is also some controversy of whether these drugs cause suppression of growth... Full Text