Ator 20 (Atorvastatin 20 mg) works by inhibiting an enzyme called HMG-CoA reductase in the liver. This inhibition reduces the liver's ability to produce LDL (low-density lipoprotein) cholesterol, often referred to as "bad" cholesterol. By lowering LDL cholesterol levels and improving the overall lipid profile, Ator 20 helps reduce the risk of atherosclerosis and cardiovascular events like heart attacks and strokes.