Background: Benzalkonium chloride (BAK) is the most used preservative in topical ophthalmic formulations. BAK causes dry eye and trabecular meshwork degeneration. Hence, BAK-free formulations are desirable for chronic conditions like glaucoma. The objective of this study was to compare efficacy versus BAK-containing suspension fixed dose combination (FDC) brinzolamide timolol on their intraocul...