Modvigil 200mg is a medication primarily used to treat excessive sleepiness caused by conditions such as narcolepsy, sleep apnea, and shift work sleep disorder. It belongs to a class of drugs called wakefulness-promoting agents. Modvigil works by stimulating the brain to increase wakefulness and alertness. It is not a substitute for proper sleep and should be used under the guidance of a healthcare professional. The recommended dosage for Modvigil is usually 200mg taken once daily in the morning. It is important to follow the prescribed dosage and not exceed it. Common side effects may include headache, nausea, dizziness, and nervousness. It is always advisable to consult a healthcare professional before starting any medication.