The active ingredient in Modalert 200 is modafinil, which reduces sleepiness caused by narcolepsy, obstructive sleep apnea, and other sleep disorders. Modalert 200 mg is used to promote wakefulness in patients with extreme sleepiness during the daytime or drowsiness caused by sleeping disorders. Improves wakefulness, keeps you awake, and reduces your tendency to fall asleep during the day, thus restoring normal sleep cycles.