Provigil is an FDA-approved medicine that is mainly used for narcolepsy. Its generic name is modafinil. It is a CNS stimulant. Provigil reduces extreme sleepiness due to narcolepsy and sleep apnea. For those who want to wake up in the daytime or during working hours, the Provigil helps them. Provigil makes your wakefulness. It comes in 100mg and 200mg.You can take 100mg daily in the morning. If more doses are needed then the doctor advised to increase.