Modafinil is a prescription medication used to promote wakefulness in people with conditions such as narcolepsy, obstructive sleep apnea–related excessive daytime sleepiness, and shift work sleep disorder. It helps improve alertness and reduce daytime drowsiness when used under medical supervision. Popular modafinil products include Modalert and Modvigil, which are available through MyModalert. Because modafinil may cause side effects or interact with other medications, it should be taken only as prescribed by a qualified healthcare professional.

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