Atorvastatin Calcium and its Impurities

A lipid lowering agent, Atorvastatin Calcium is used in the treatment of cardiovascular diseases.It is a competitive inhibitor of HMG-CoA reductase.It is a pyrrole and heptanoic acid derivative. Reference standards of Atorvastatin Calcium API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.