Provigil (modafinil) is a medication that promotes wakefulness. It is thought to work by altering the natural chemicals (neurotransmitters) in the brain.Provigil is used to treat excessive sleepiness caused by sleep apnea, narcolepsy, or shift work sleep disorder.You should not
use Provigil if you have ever had an allergic reaction or skin rash while taking modafinil or armodafinil (Nuvigil).