Modvigil 200 is a brand of Modafinil, that promotes wakefulness and treats narcolepsy, sleep apnea, and shift work sleep disorder. Modvigil 200 tablets contain 200 mg Modafinil. Modvigil, like Modalert and Waklert, enhances cognition. Modafinil increases alertness and cognitive performance by affecting brain chemicals including dopamine and norepinephrine. People with sleep disorders who are sleepy throughout the day are prescribed Modvigil 200. Modvigil 200 may interact with other drugs and have negative effects, therefore use it under medical supervision. Common side effects are headache, nausea, and sleeplessness. A healthcare professional can adjust Modvigil 200 to individual sleep disorders and make it safer and more effective.