Intraocular Pressure-lowering Efficacy of Brinzolamide When Added to Travoprost/Timolol Fixed Combination as Adjunctive Therapy

Abstract

PURPOSE: To compare the efficacy of brinzolamide versus placebo when added to travoprost/timolol fixed combination (TTFC) in uncontrolled patients. PATIENTS AND METHODS: 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. RESULTS: 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). CONCLUSIONS: 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.