modvigil-200 Modvigil 200 can give you a boost to your cognitive needs. This includes up to 12 hours of focus, increased retention, more productivity, less feeling of fatigue, and even the potential for weight loss. There is no consensus on the established mechanism of action of Modvigil as a study drug. However, some researchers mention several explanations. One of the inducers of sleep is free radicals in the body. Modvigil is said to be capable of targeting this so that the sleepy feeling can be eliminated.