Arch Int Pharmacodyn Ther. 1977 Jul;228(1):68-72.

Delta9-THC as a discriminative cue in pigeons: effects of delta8-THC, CBD, and CBN.

Abstract

Pigeons, trained to discriminate the effects of i.m. injections of delta9-tetrahydrocannabinol (delta9-THC, 0.25 mg/kg) from the effects of the vehicle in a drug discrimination paradigm, were tested for generalization with the isomeric delta8-THC, cannabidiol (CBD) and cannabinol (CBN). When given in sufficient doses, delta8-THC and CBN were found to substitute for delta9-THC whereas CBD did not. CBD and CBN did not antagonize the stimulus effect of delta9-THC. The combination of CBN and delta9-THC rather appeared to accentuate the drug response.

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