"i have been on vyvanse for over a year, started at 20mg then 30,40,50 and decided 40mg was perfect for me. i am a college student and have always had undiagnosed adhd. my grades in high school were mostly c&#039;s and b&#039;s. after being on vyvanse my grades went up. it was weird because i felt more over-stimulated adderall type buzz/high feeling at 20 and 30mgs. i liked that feeling but i was having side effects like lack of sleep. i actually then upped my dose to 50mgs. around that time i was holding 2 jobs and studying full time, 6 college classes. the 40 and 50mg actually made me feel more normal as if i wasn&#039;t taking anything except my mind was focused. i lacked side effects and everything was perfect. my grades are now 3.5gpa thanks to vyvanse."