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. 2011 Oct 2;17(10):1228-30.
doi: 10.1038/nm.2435.

Nonopioid placebo analgesia is mediated by CB1 cannabinoid receptors

Fabrizio Benedetti  1 , Martina Amanzio, Rosalba Rosato, Catherine Blanchard
Affiliations
Free article

Nonopioid placebo analgesia is mediated by CB1 cannabinoid receptors

Fabrizio Benedetti et al. Nat Med. .
Free article

Abstract

Placebo analgesia is mediated by both opioid and nonopioid mechanisms, but so far nothing is known about the nonopioid component. Here we show that the specific CB1 cannabinoid receptor antagonist 5-(4-chlorophenyl)-1-(2,4-dichloro-phenyl)-4-methyl-N-(piperidin-1-yl)-1H-pyrazole-3-carboxamide (rimonabant or SR141716) blocks nonopioid placebo analgesic responses but has no effect on opioid placebo responses. These findings suggest that the endocannabinoid system has a pivotal role in placebo analgesia in some circumstances when the opioid system is not involved.

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