Modafinil, the active constituent present in Modafinil is classified under schedule IV controlled substance by the USFDA. It is a highly researched drug molecule. The molecular formula of Modafinil is C15H15NO2S and its molecular mass is 273.35. The chances of addiction and dependence of Modafinil Generic are relatively low. It belongs to a pharmacological class called wakefulness-promoting agents/ Psychoanaleptic. The exact mechanism of Modafinil is not known. It is supposed to increase the levels of various neurotransmitters in the brain such as orexin, dopamine, histamine, and norepinephrine. The role of orexin is regulating sleep-wake cycles, dopamine helps to improve focus, and norepinephrine increases mental energy. The action of this medication is observed within 20 to 60 minutes after taking the medicine orally, while its effect stays for a period of about five to ten hours.