Modafinil is an oral drug prescribed by doctors to treat symptoms of narcolepsy, excessive sleepiness, and shift work sleep disorder. The doctor usually prescribes 200mg of Modafinil to be taken once daily. To treat, narcolepsy or obstructive sleep apnea, it is advised to be taken in the morning to avoid evening restlessness or insomnia. fastest Modafinil delivery from USA online medicine store.