March 1991
Volume 32, Issue 3
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Articles  |   March 1991
Dose-related effects of prostaglandin F2 alpha isopropylester on intraocular pressure, refraction, and pupil diameter in monkeys.
Author Affiliations
  • K S Crawford
    Department of Ophthalmology, University of Wisconsin, Madison.
  • P L Kaufman
    Department of Ophthalmology, University of Wisconsin, Madison.
Investigative Ophthalmology & Visual Science March 1991, Vol.32, 510-519. doi:
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      K S Crawford, P L Kaufman; Dose-related effects of prostaglandin F2 alpha isopropylester on intraocular pressure, refraction, and pupil diameter in monkeys.. Invest. Ophthalmol. Vis. Sci. 1991;32(3):510-519.

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Abstract

Topical application of Prostaglandin F2 alpha (PGF2 alpha) to the eye reduces intraocular pressure (IOP) in all mammalian species studied thus far, including humans. The L-isopropylester derivative is currently the one most commonly used in experimental and clinical studies. Dose-response relationships were determined between PGF2 alpha-IE and IOP, pupillary diameter, and refraction in ketamine-anesthetized ocular normotensive cynomolgus monkeys. Single doses of 10 and 30 micrograms had smaller and less consistent but longer lasting IOP-lowering effects than repeated doses (twice daily for 3 days) of 1-5 micrograms. For repeated dosing in this manner, the just-maximal dose is probably between 2-5 micrograms, producing a approximately 70% reduction in IOP to a final IOP of approximately 5 mm Hg. Continuing treatment for up to 18 days did not further enhance the efficacy of twice daily treatment with a submaximal 1-microgram dose. Partial reversal of anesthesia-induced tonic accommodation occurred with single 10- and 30-micrograms doses and with repeated 1-microgram doses, but additional myopia of 0.5-1.5 diopters was induced with repeated higher doses. These physiologic findings and previous morphologic data are consistent with a proposed dual PG action on the ciliary muscle, one involving a short-onset long-lasting direct effect on the muscle fibers (causing relaxation and narrowing of the muscle bundles) and the second involving a slowly developing but shorter duration dissolution of the intermuscular connective tissues.

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