I've only done vyvanse once, I absolutely loved it! I felt amazing, everything was beautiful and it lasted for 16-17 hrs!! Plus if you have insurance than it's only a *snip - no prices* copay for a one month supply, but I just steal it from my cousin every Friday when we hang out and have a sleep over. I take about 6 from her supply and 6 from her sisters, they both have ADHD