ADHD
"My son, 12, is on 20 mg of Vyvanse.  He is ADHD and has reacted poorly to most of the other stimulants we tried.  The 30 mg caused him to have side effects of stomach pains and emotional irritability and rebound problems.  By switching him to 20 mg he is able to maintain his junior high honors classes and be functionable and focused. By going down to the 20 mg he is able to have a personality and yet not be flicking and annoying people.  Without the medicine he was unable to stay seated at the piano to practice and now he is proficient and can practice on his own without me telling him to sit down every 3 minutes.  It has also been a tremendous self esteem boost."