Modalert 200mg is used to treat excessive daytime drowsiness caused by sleep disorders such narcolepsy, obstructive sleep apnea, and shift work sleep disorder. A central nervous system (CNS) stimulant without amphetamines that promotes wakefulness is called modafinil. For narcolepsy or obstructive sleep apnea, a daily dose of 200 mg of modafinil should be taken orally in the morning. Modafinil has been demonstrated to considerably increase overnight sleep latency and decrease levels of drowsiness. Additionally, it has been discovered to lessen excessive diurnal somnolence and self-rated weariness.