5-HT3 is a serotonin receptor. 5-HT3 is not a classic cannabinoid receptor but its activity is modulated by cannabinoids. Since cannabinoids have a physiological effect on 5-HT3 it is effectively a cannabinoid receptor.

Chemical Name: 
5-HT3 receptor
IUPHAR entry: 
Wikipedia entry: 

5-HT3 is widely expressed throughout the central and peripheral nervous system.

Literature Discussion: 

Anandamide Δ9THC  


Pertwee, R.G., Howlett, A.C., Abood, M.E., Alexander, S.P.H., Di Marzo, V., Elphick, M.R., Greasley, P.J., Hansen, H.S., Kunos, G., Mackie, K., et al. (2010). International Union of Basic and Clinical Pharmacology. LXXIX. cannabinoid receptors and their ligands: beyond CB₁ and CB₂. Pharmacol. Rev. 62, 588–631.