One well-known brand of modafinil, which promotes wakefulness, is called Modalert 200. Modalert 200 usually lasts 12 to 15 hours, depending on tolerance levels, dose timing, and individual metabolism. It is frequently used in the morning by users to prevent disruptions to their sleep at night. One to two hours after intake, it begins to function. Modalert 200's prolonged duration of action makes it a useful treatment for narcolepsy, obstructive sleep apnea, and shift work sleep disorder. It should be taken carefully to avoid sleeplessness, nevertheless, because of its long-lasting effects. Prior to beginning or modifying Modalert 200 use, always get medical advice.