Modvigil is a brand of generic Modafinil. Modafinil is an oral drug that is used to improve wakefulness in patients with excessive sleepiness. Modvigil to those who suffer from obstructive sleep apnea/hypopnea syndrome, or with narcoleptic patients, and also those who suffer from shift work disorder. Some people use this “smart drug” to improve their focus and concentration, mental energy and also may have a positive effect on individuals suffering from anxiety or depression.