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Abstract: A procedure was developed for screening of cannabinoids for their ability to reduce intraocular pressure (IOP) using normal rabbits. Eight animals per group were used for statistical significance of data. A negative control group was used for every screen as well as a positive control with 1.5 mg/kg Δ9-THC given intravenously (I.V.). All compounds were tested by I.V. injection and IOP measurements were taken periodically for 5 hours. Data were analyzed by a computer program which takes into account the change in IOP of the control group. Following this procedure we found that Δ8-THC, Δ9-THC, cannabinol, and nabilone were active while cannabidiol was inactive.