Modvigil 200 mg (https://www.genericmedsaustralia.com/product/modvigil-200-mg-australia/)(Provigil) is a wakefulness-promoting drug that works by changing the amount of certain natural substances in the brain that regulate sleep and wakefulness. Taking it can increase energy and boost productivity at work, as well as in other aspects of your life. It is usually metabolized in the liver, and its half-life ranges from 10 to 12 hours. The length of time it stays in your system depends on the dose you take, your age, and other factors.