Description
R-84760 is a kappa-opioid receptor agonist. R-84760 produces an extremely potent antinociceptive effect against tonic pain through the kappa-opioid receptors; the sites of action of subcutaneously administered R-84760 are the supraspinal and spinal loci in the central nervous system; and a part of the mechanism of the antinociceptive effect of R-84760 is activation of the descending noradrenergic pathway