The Provigil 200mg tablet is the most common therapeutic strength of modafinil, specifically designed to serve as the "gold standard" for managing excessive daytime sleepiness. For patients with narcolepsy or obstructive sleep apnea, a single 200mg dose taken in the morning is the clinical baseline, providing a sustained window of alertness that typically lasts between 10 to 12 hours. If used for Shift Work Disorder, the 200mg dose is ideally timed for ingestion approximately 60 minutes before a work shift begins to ensure the medication peaks just as peak performance is required.