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To compare the efficacy of brinzolamide versus placebo when added to travoprost/timolol fixed combination (TTFC) in uncontrolled patients.This was a prospective, double-masked, randomized, placebo-controlled, parallel comparison of ocular hypertensive or primary open-angle glaucoma patients. Patients treated with a prostaglandin-based mono or adjunctive therapy were changed to TTFC qam (every day dosing) for 4 weeks. Patients with an intraocular pressure (IOP) of 19 to 32 mm Hg at 08:00 hours underwent additional measurements at 12:00 and 16:00 hours. Patients were then randomized to either placebo or brinzolamide given twice daily in addition to TTFC. At week 12, patients had their IOP measurements repeated.The per protocol dataset consisting of 78 placebo and 75 brinzolamide-treated patients decreased mean diurnal IOP (mm Hg) as well as IOP at all 3 individual time points (P≤0.005). Brinzolamide reduced the mean diurnal IOP from 20.3±2.0 to 17.5±2.6, whereas placebo reduced IOP from 20.9±2.7 to 19.4±3.8. The mean diurnal IOP was reduced from baseline and for the 08:00 and 16:00 hours time points in the brinzolamide group compared with placebo (P≤0.014). There were 30 adverse events with placebo and 24 with brinzolamide (intent-to-treat). There was no statistical difference for the side-effect profile observed between the treatment groups (P=0.47).This study suggests that brinzolamide may be safely added to TTFC therapy to provide further significant reduction in IOP patients with ocular hypertensive or primary open-angle glaucoma.