 Modafinil is a eugeroic used for treatment of narcolepsy, shift work sleep disorder, and excessive daytime sleepiness associated with obstructive sleep apnea.For obstructive sleep apnea, it is recommended that continuous positive airway pressure be appropriately used before considering starting modafinil to help with daytime sleepiness.Because of the risk for development of skin or hypersensitivity reactions and serious adverse psychiatric reactions, the European Medicines Agency has recommended that new patient prescriptions should be only to treat sleepiness associated with narcolepsy.