Lisdexamfetamine
"My son is 13 and has been on several ADHD medications.  I liked the Vyvance at first because I did see an improvement in his ability to sit and listen and pay attention, however it didn't last long enough.  The doctor has increased the dosage several time and now he is up to 60mg daily. The problem is that he has lost over 20lbs because he simply won't eat and now it seems after four months on this medicine its like his body has adapted to it and he is super hyper.  I spoke to the doctor about it and he said he can do real damage at his age with the weight loss and not eating and that the stimulant is actually wiring him up.  We are going to take him off of the Vyvanse and put him on a non stimulant medication."