Modafinil is a stimulant used medically in the treatment of
narcolepsy. It holds the promise of allowing people who suffer from unusual fatigue to remain awake without side effects or impairment of job
performance. The usual prescription is for one pill to be taken shortly after waking; its effects last for most of the day, but do not usually prevent the person from going to sleep at a normal time. It is prescribed under the trade name Provigil ®.
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