Modvigil 200 mg is a medication commonly prescribed for the treatment of excessive sleepiness caused by narcolepsy, obstructive sleep apnea, and shift work sleep disorder. It contains the active ingredient modafinil, which is a wakefulness-promoting agent. Modvigil 200 mg works by stimulating certain areas of the brain that control wakefulness and alertness. It is typically taken once a day in the morning, with or without food. The recommended dosage may vary depending on the individual's condition and response to the medication. It is important to follow the instructions provided by the healthcare professional and not exceed the prescribed dosage. Common side effects of Modvigil 200 mg may include headache, nausea, nervousness, and insomnia. It is advisable to inform the healthcare professional about any existing medical conditions and medications being taken before starting Modvigil 200 mg.