Armodafinil is the active ingredient that is present in Waklert. It is the R-enantiomer of modafinil. Armodafinil chemical formula is C15H15NO2S, and the molecular weight is 273.35. This potent nootropic drug appears white in crystalline powder form. It is sparingly soluble in water, whereas soluble in acetone and methanol. This ingredient enhances cognitive abilities by acting on neurotransmitters in the Central Nervous System (CNS). Armodafinil acts on dopamine, a brain chemical. This action of Armodafinil helps to control the sleep/wake-up cycle and helps to stay awake until a considerable period.