Both Uses

amphetamine
in
Gym Candy
(Auto-generated)

This stuff is an amphetamine-steroid mix.†
Part 5 *

amphetamine = a powerful stimulant drug that increases activity in the brain and nervous system -- often addictive
An adrenaline-steroid-amphetamine craziness came over me, and pretty soon I was screaming and bouncing up and down more than anyone.†
Part 5

Definitions:

(1) (amphetamine)
a strong stimulant drug that increases activity in the brain and nervous system -- sometimes prescribed (in controlled doses) for conditions like ADHD but with a high risk of dependence and misuse

Amphetamines can increase alertness, energy, and focus and often reduce appetite. Because people can develop tolerance (needing more to get the same effect) and the drug can be addictive, medical use is tightly controlled and misuse is dangerous.
(2) (meaning too rare to warrant focus)