ADHD
"I&#039;m 21 years old, and have been on Vyvanse for 5 months (40mg). Compared to other medications its more evenly released throughout the day and seems to last around 8 or 9 hours. I would definitely suggest giving it a month before you completely ban it, because it did take getting use to (like any medication). It can effect your sleep depending on the time of day you take your medication. It hasn&#039;t decreased my appetite, but in the beginning I would forget to eat- as long as you get on a routine eating schedule though you should be fine. It made me slightly irritable in the beginning, but like I said give it some time and it seems to even out."