AM6538 (1~10 mg/kg) antagonizes the antinociceptive effects of cannabinoid agonists in mice.
AM6538 (10 mg/kg) shows that there are some recovery in the effects of AM4054. AM6538 dose dependently decreases the tau values for all cannabinoid agonists, reflecting reductions in the available receptors. AM6538 produces enduring antagonism, with robust effects on the tetrahydrocannabinol dose-effect function evident up to 7 days after treatment.