A class of drugs that stimulates the central nervous system and produces increased wakefulness and focus in the user. Amphetamines are drugs that mimic the effect that adrenalin has on the body. They are known as uppers, bennies, beans, speed, and crank. Amphetamines vary in appearance, from white pills to powder or crystals. This drug can be ingested orally, injected, sniffed, or smoked.

A person who is addicted to amphetamines can develop a tolerance for them very quickly. The addict continues to use to try to recreate the first, intense high they experienced while using the drug. A person addicted to amphetamines can have psychotic episodes while using.