Atorvastatin is used in the treatment of high cholesterol. it 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) and triglycerides, raising the level of "good" cholesterol (HDL). Constipation, Headache, Increased glucose level in blood, Indigestion, Muscle pain are the common side effect of this medicine ,if any symptom bother you let your doctor know. Take as directed by physician.