Kumar Kapilet al., have prepared and evaluated niosomes containing atorvastatin calcium, using different surfactants like span 20, 40, tween 20, 40, and cholesterol by modified ether ejection method. On the basis of drug content, particle size morphology, in vitro release and stability studies, it can be concluded that formulation NS4 (Tween 40: cholesterol, 200:100) was an optimum formulation