Atorvastatin (a TORE va sta tin) treats high cholesterol and reduces the risk of heart attack and stroke. It works by decreasing bad cholesterol and fats (such as LDL, triglycerides) and increasing good cholesterol (HDL) in your blood. It belongs to a group of medications called statins. Changes to diet and exercise are often combined with this medication. This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.