Modafinil is typically effective for 12 to 15 hours, depending on individual factors like metabolism, dosage, and sensitivity. After taking a standard 200 mg dose, most users feel alert within 30 to 60 minutes, with peak effects occurring around 2 to 4 hours later. Its long half-life (about 12–15 hours) supports sustained wakefulness, making it ideal for managing conditions like narcolepsy or shift work disorder. To avoid insomnia, it's best taken early in the day under medical supervision.
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Modalert 200 is effective for 12 to 15 hours in the treatment of narcolepsy-related daytime drowsiness. It starts functioning within 30-60 minutes and stays attentive for the most of the day. To achieve the optimum benefits and minimise sleeplessness, it is normally used in the morning under physician supervision.