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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.
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