Provigil 100 mgis widely used by people to treat their excessive sleepiness. Which may have been caused by narcolepsy, sleep apnea, or shift work sleep disorder. It works so well and shows its results effectively. This medicine should not be used as a sleeping pill. The active ingredient in each Provigil 100 mg tablet is modafinil. Modafinil should only be used by adults who suffer from narcolepsy.Provigilis a controlled substance and is classified as a Schedule IV prescription drug.