"i&#039;m 23 and have tried just about every adhd medication out there. i&#039;ve been on vyvanse for some time now and it&#039;s great! i have energy, i can focus at work and school. it lasts the entire day and then some. the only drawback is you won&#039;t eat. you&#039;ll be hungry your stomach will growl but you can&#039;t eat. sleeping is tough because it&#039;s a stimulant so i was put on sleep meds to help. you might have a jittery feeling and increased heart rate at first. it takes about an hour or so to kick in but it&#039;s a fantastic medicine. it&#039;s also very powerful. all you gotta do is not take it past 2pm at absolute latest or you&#039;ll lie awake forever in bed. eat prior to ingesting because you won&#039;t eat later. it&#039;s great, try it!"