Effects of topical anandamides on intraocular pressure in normotensive rabbits.

A series of anandamide-type compounds were synthesized and studied for their effect on the intraocular pressure (IOP) of normotensive pigmented rabbits. Each test compound was dissolved in an aqueous 2-hydroxypropyl-beta-cyclodextrin solution and administered (31.25 - 62.5 micrograms) unilaterally to the eye. The most promising anandamides caused a statistically significant reduction of IOP in treated eyes, usually preceded by an initial transient elevation of IOP, compared to saline controls. In the contralateral untreated eyes, only a marginal or short hypotensive response was observed. Indomethacin pre-treatment (12.5 mg, s.c.) eliminated the IOP response to administered anandamides and arachidonic acid.