Most people find that Modvigil 200mg lasts between 8 and 12 hours. Depending on the person’s general health, dose, metabolism, and other variables, the duration of its effects might change. Modvigil is frequently used to treat excessive daytime drowsiness brought on by disorders such shift work sleep disorder, obstructive sleep apnea, and narcolepsy. It does not take the place of sleep, even if it keeps one awake during the day. Usually occurring 30 to 60 minutes after administration, the drug’s wakefulness-promoting effects peak 2 to 4 hours later. To properly treat your symptoms, always use Modvigil under a doctor’s supervision.