Nuvigil is the right: side of the Provigil molecule. Efficacy & side effects are the same. See http://www.diffen.com/difference/Nuvigil_vs_Provigil. Provigil now comes in a generic form. Nuvigil may last a little longer, causing more risk of insomnia. Both are FDA-approved for narcolepsy, Obstructive Sleep Apnea for the 30% of CPAP or BiPAP users who don't respond optimally to their use alone & shift worker disorder.
Answered 2/15/2015
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