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Nuvigil is a mono isomer of modafinil and is a member of the eugeroics class of medicines, that are stimulants and produce long-lasting mental arousal. Nuvigil is a prescription medication used to treat excessive drowsiness caused by obstructive sleep apnea (OSAHS), narcolepsy, or shift work sleep disorder (SWSD). You can easily buy Nuvigil online if you are suffering from any of the aforementioned disorders.