Pirenoxine and its Impurities

Pirenoxine is an ophthalmic drug used in several countries, particularly in Asia, for the treatment and prevention of cataracts. It is available as eye drops and sold under various brand names, such as Catalin and Kary Uni. Reference standards of Pirenoxine API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.