Modafinil and Armodafinil are Eugeroics i.e., Wakefulness promoting agents and are used in dealing with Narcolepsy, Obstructive Sleep Apnea and Shift Work Disorder. Modafinil and Armodafinil are FDA approved psychostimulant, CNS wakefulness modulator works by targeting neurotransmitters like dopamine, Orexin, Hypocretin, Histamine, GABA, just by inhibiting their reuptake and increasing their level for alertness and executive function.