Modvigil 200 Tablet is a medication used to treat narcolepsy. It is known for its effectiveness in reducing excessive daytime sleepiness and improving wakefulness in individuals with this sleep disorder. The active ingredient in Modvigil 200 is modafinil, a central nervous system stimulant that works by increasing the levels of certain chemicals in the brain that regulate sleep and wakefulness. It is usually taken once a day in the morning, with or without food. Common side effects of Modvigil 200 may include headache, nausea, nervousness, and trouble sleeping. It is important to follow the prescribed dosage and consult a healthcare professional for any concerns or questions regarding the use of Modvigil 200 for narcolepsy.