dextroamphetamines (including
Vyvanse, which is
low intensity but has been engineered to last a long time--say, a peak intensity lasting 6 to 10 hours), adderall (which is mix, I think, of a slight variations of some kind of amphetamine), and then of course really intense stuff like methamphetines (which I know very little about, but which has ruined a lot of people's lives--think of it as kind of like crack cocaine, the most addictive and destructive form of coke).