], any one of a group of drugs that are powerful central nervous system stimulants
. Amphetamines have stimulating effects opposite to the effects of depressants
such as alcohol, narcotics
, and barbiturates
. They raise the blood pressure by causing the body to release epinephrine
, postpone the need for sleep, and can reverse, partially and temporarily, the effects of fatigue. Amphetamines enhance mental alertness and the ability to concentrate, and also cause wakefulness, euphoria, and talkativeness. Benzedrine is the trade name for the drug amphetamine; dextroamphetamine is marketed as Dexedrine. Methamphetamine, a potent stimulant marketed as Desoxyn, is the most rapidly acting amphetamine. They are available by prescription for limited uses; illegal sources include stolen or diverted supplies or clandestine laboratories.
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