Lipitor 40 mg tablets contain atorvastatin which is used in the treatment of high cholesterol and high triglycerides. Lipitor 40 mg Tablet is a lipid-lowering medication (statin). It works by blocking an enzyme (HMG-CoA-reductase) that is required in the body to make cholesterol. It thus lowers “bad” cholesterol (LDL) triglycerides and raises “good” cholesterol (HDL). It helps prevent heart attack and stroke.