Brinzolamide(AL 4862) is a potent carbonic anhydrase II inhibitor with IC50 of 3.19 nM. Target: carbonic anhydrase II Brinzolamide (< 1 mg) ophthalmic suspension lowers intraocular pressure in Dutch-belted pigmented rabbits in a dose-dependent manner with an onset within 0.5 hour and a peak response by 1-2 hours. Brinzolamide (0.6 mg) ophthalmic suspension lowers intraocular pressure in laser-treated glaucomatous cynomolgus monkeys in a dose-dependent manner with an onset within 1 hour and a peak response by 3 hours. Brinzolamide dosages of 30 mg/kg, produces a 44% reduction in intestinal charcoal meal progression, but 1 and 10 mg/kg produced 8% and 18% decreases, respectively, in male CD-1 mice. Brinzolamide of 1 mg/kg, 10 mg/kg, and 30 mg/kg prolongs barbiturate sleep time by 57%, 15%, and 35%, respectively, in male CD-1 mice [1]. Brinzolamide (< 3%) produces significantly greater mean percent intraocular pressure reductions and mean intraocular pressure reductions compared with placebo in patients with primary, open-angle glaucoma or ocular hypertension. The optimal intraocular pressure-lowering concentration of brinzolamide is 1%, brinzolamide 1% is well tolerated by patients with primary open-angle glaucoma or ocular hypertension when administered twice daily [2].