Modafinil is a wakefulness-enhancing substance that was first manufactured and marketed by Cephalon Inc under the brand name Provigil. That’s the brand that you’ll get if you have a Modafinil prescription. Doctors prescribe Modafinil for narcolepsy, obstructive sleep apnea and other sleep-related disorders. Still, the vast majority of Modafinil users use it for improved performance on long and complex tasks. Entrepreneurs, professionals, students and athletes use Modafinil for its potent cognitive and physically-enhancing effects.