Cannabidiol lacks CB1 receptor agonist or antagonist activity in primates.
Cannabidiol amounts larger than those in Cannabis or nabiximols enhance Δ9-THC.
Cannabidiol and a 5-HT1A receptor agonist have overlapping behavioral effects.
5-HT1A agonism enhances the CB1 receptor-mediated effects of Δ9-THC.