"i am a 20 year old college student who was working full time when i started taking this medicine, vyvanse. at the time when i was first given this medicine i was about 140lbs and i&#039;m 5&#039;7&quot;. and after about 4 months of taking the vyvanse i weighed anywhere between 115-120lbs. not good! the medicine made me totally not eat and run around like i was on drugs and couldn&#039;t sit still. i became so skinny i could see all of my ribs. i also felt like i had lost all emotions and the relationship with my parents were harmed because of this. i think part of the problem was the doctor just upping my dose whenever he felt like it and not being very responsible. but i just want to warn anyone who is thinking about taking vyvanse to be careful and have a doctor who cares."