When prescribed, stimulants like the amphetamines Adderall,Adderall XR, Dextroamphetamine, and Mydasis can help people with ADHD. But some people use amphetamines to get high, to boost energy and alertness, or to keep their weight down. You can get addicted to stimulants. High doses can cause a dangerous rise in body temperature, irregular heartbeat, and even cardiac arrest. Nicknames for amphetamines include "bennies," "black beauties," and "speed."