Provigil 200mg is a generic smart drug that reduces and prevent excessive sleepiness caused by sleep disorders, including narcolepsy and obstructive sleep apnea (OSA). It contains an active drug Modafinil, which is a prescription drug, intended to promote wakefulness during work hours, especially if you have a work schedule that keeps you from having excessive sleep. Provigil is effective for people who have shift work sleep disorder.