Antazoline Sulfate and its Impurities

Antazoline Sulfate is used to relieve nasal congestion. It is also formulated as eye drops with naphazoline to relieve allergic conjunctivitis. It is a 1st generation antihistamine with anticholinergic properties. Reference standards of Antazoline Sulfate API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.