How many hours is modafinil effective?

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Modvigil 200mg is used to help people with disorders including narcolepsy and obstructive sleep apnea stay awake. Many report that Modvigil 200 begins to work 30 to 90 minutes after taking it. Instead of a rapid "kick," the effect is typically gradual. Users frequently report improved attention, less drowsiness, and clearer thinking. The feeling is usually softer and more subdued than a powerful amphetamine surge. How obvious the beginning is and how long the alertness lasts might depend on a number of factors, including sleep quality, metabolism, food consumption, and individual sensitivity.