Modvigil 200 mg is a medication that contains the active ingredient modafinil. It is commonly prescribed to treat excessive sleepiness caused by narcolepsy, sleep apnea, and shift work sleep disorder. Modvigil 200 works by affecting certain chemicals in the brain that control sleep and wakefulness. It is classified as a wakefulness-promoting agent and is not considered a stimulant. The recommended dosage for Modvigil 200 is usually taken once daily in the morning. It is important to follow the instructions provided by your healthcare provider and not exceed the prescribed dosage. Common side effects of Modvigil 200 may include headache, nausea, nervousness, and trouble sleeping. It is important to discuss any potential risks or concerns with your healthcare provider before starting Modvigil 200.