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Provigil is a prescription wakefulness-promoting medication primarily used to treat excessive daytime sleepiness associated with narcolepsy, obstructive sleep apnea, and shift work sleep disorder. Classified as a eugeroic, it differs from traditional stimulants like amphetamines by selectively targeting the brain's hypothalamus to regulate the sleep-wake cycle without causing the intense "jittery" sensations or the severe energy crashes typical of older drugs. While its exact mechanism is not fully understood, it is believed to increase levels of neurotransmitters like dopamine and orexin, enhancing alertness and cognitive clarity for up to 12 to 15 hours. Despite its lower potential for abuse, it is a Schedule IV controlled substance that requires medical supervision, particularly due to rare but serious risks like severe skin rashes or interactions that can reduce the effectiveness of hormonal birth control.