AN ANALYTICAL STUDY FOR DEVELOPMENT AND VALIDATION OF METHOD FOR ESTIMATION OF TOTAL BENZALKONIUM CHLORIDE CONTENT AS A PRESERVATIVE IN AZELASTINE HYDROCHLORIDE PHARMACEUTICAL OPHTHALMIC FORMULATION BY REVERSE PHASE LIQUID CHROMATOGRAPHY APPROACH. Int. J. Pharm. Sci. Drug Res. [Internet]. 2017 Sep. 1 [cited 2025 Oct. 24];9(5):268-74. Available from: https://ijpsdronline.com/index.php/journal/article/view/583