colestyramine and its Impurities

Colestyramine is a cholesterol-lowering agent used to lower high levels of cholesterol in the blood. It is a bile acid sequestrant, which binds bile in the gastrointestinal tract to prevent its reabsorption. Reference standards of Colestyramine API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.