Suspensions of Forskolin in concentrations of 0.3; 0.6; and 1.0% decreased effectively the intraocular pressure of healthy subjects when instillated in the conjunctival sac. The suspensions were compared with placebo in double blind studies. The maximum effect was reached 3 hours after application of the 0.3% (22.8%) and 0.6% (27.8%) suspensions and 4 hours after the 1.0% (26.5%) suspension. The higher concentrations decreased the intraocular pressure to the same extent as the lowest concentration but the effect lasted longer: 4 hours after instillation of the 0.3% suspension, 5 hours after instillation of the 0.6% suspension and 7 hours after the 1.0% suspension. The suspensions were well tolerated. Subjective sensations like burning, itching and augmentated lacrimation were observed only in a minor amount and for a short period of time.
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