Modavinil is commonly referred to as a eugeroic because of its ability to increase wakefulness and alertness. Modafinil is now approved by the Food and Drug Administration for use in treating excessive daytime sleepiness in individuals suffering from a variety of conditions, including narcolepsy. It's also prescribed for people who suffer from shift work sleep disturbance. Your illness and reaction to therapy are the only factors in determining the appropriate dosage. Symptoms of withdrawal are possible if you suddenly stop taking this drug ( such as shaking, vomiting, sweating, chills, nausea, vomiting, confusion).