"i am 20 yrs old and i have been taking vyvanse for about 2 years now ...i take 60mg about the same time each morning and it really does wonders in helpig me concentrate and getting everything done both at home and school. i&#039;ve noticed a big difference in myself on the days i do take it and on the days i don&#039;t. only side effects are the loss of appetite, headaches from not eating (from the loss of appetite), dry mouth, irritability and now i have depression.. don&#039;t know if i should lower my dosage now or maybe it&#039;s from another cause."