Provigil stays in a person's system for several days after it is taken. The drug is used to treat sleep disorders in adults according to the Provigil website.
Provigil is often prescribed by doctors to patients suffering from sleep apnea or other disorders that affect their sleep. The medication is considered a controlled substance, so users can only obtain it through a prescription obtained from a doctor. On occasion, doctors use Provigil with other medications to treat or eliminate symptoms from sleep disorders. The medication is designed for adults only and side effect can include dizzy spells, sores in the mouth and a skin rash.