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Effects of latanoprost and unoprostone when used alone or in combination for open-angle glaucoma
1The Department of Ophthalmology, Tokyo Medical University, Hachioji Medical Center, 1163 Tatemachi Hachioji, Tokyo, 193-0998, Japan. nmsaito@d8.dion.ne.jp
Purpose:
To evaluate the effects of latanoprost and unoprostone on the intraocular pressure (IOP) and on the tonographic outflow facility in glaucoma patients when used alone or in combination.
Design:
Open label randomized clinical study.
Methods:
Fifty-two patients (52 eyes) with primary open-angle glaucoma were randomly divided into two groups. One group initially received only latanoprost 0.005% once daily and the other group, only unoprostone 0.12% twice daily. The study period was 12 weeks: in the first 6 weeks, latanoprost or unoprostone was given as monotherapy, and in the last 6 weeks, patients received both drugs. IOP was measured every 2 weeks by one investigator masked to the medication received by patients during the study period in the same hour as on the baseline day. At Weeks 0, 6, and 12, the coefficient of aqueous outflow was measured by tonography.
Results:
With latanoprost monotherapy, the baseline IOP of 22.9 +/- 2.4 mm Hg (mean +/- SD) decreased to 16.9 +/- 2.1 mm Hg (P<.01). When unoprostone was added to latanoprost, the IOP remained at 16.7 +/- 2.5 mm Hg. With unoprostone monotherapy, the baseline IOP of 22.7 +/- 2.1 mm Hg decreased to 19.4 +/- 2.4 mm Hg (P<.01). When latanoprost was added to unoprostone, the IOP decreased to 16.8 +/- 1.7 mm Hg (P<.01). There was no significant change in the coefficient of aqueous outflow with monotherapy or the combined use of the drugs.
Conclusions:
The combination of latanoprost and unoprostone does not result in a more potent hypotensive effect than latanoprost alone.