"my 10 yr old daughter was put on low dose (20mg) of vyvanse for adhd.  her adhd was severely affecting her school work.  positive:  immediately teachers and i noticed she could focus, sit more still, and initiate her own homework, etc...  but it&#039;s the negative side affects that seriously concerned me.  she went from a cheerful, joyous girl, to a melancholy zombie.  even worse, she became more and more depressed &amp; irritable at night.  she said she felt like she lost all personality and had a sadness that she didn&#039;t understand why.  i can not emphasize enough how scary it was to see her whole personality change, and that was not worth any benefits.she got out of vyvanse. other side effects:  loss of appetite, joint/muscle pain, mouth twitch."