Atorvastatin 20 is commonly used to lower bad cholesterol levels (LDL-C) and fats (triglycerides) in the blood. It also increases good cholesterol levels (HDL). Improving your cholesterol levels helps decrease your risk of heart disease, stroke, and heart attack.Atorzo-20 may also be used for other conditions as determined by your healthcare provider.Atorvastatin lowers blood cholesterol levels by decreasing the amount of cholesterol made by your liver and by increasing the breakdown of bad cholesterol.