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...ility for the body to combat pain naturally). In contrast to direct opiate agonists, which elicit opiate withdrawal symptoms when discontinued in opiate-toler [[Category:Kappa antagonists]]

...eral years away ([[pethidine]] was invented in Germany in 1937) and opioid agonists amongst the semi-synthetics were analogues and derivatives of codeine such ...bind to the [[sigma receptor|σ-receptor]], it has been shown that σ-agonists, such as (+)-[[pentazocine]], antagonize morphine analgesia, and σ-antagon

...], and competitive [[competitive antagonist|antagonist]] activity at the [[kappa opioid receptor|κ-opioid receptor]]. Buprenorphine [[hydrochloride]] was f ...e has been shown to act as an epsilon-opioid antagonist. Several selective agonists and antagonists are now available for the putative epsilon receptor,<ref na

...0">{{cite journal |author=Dortch-Carnes J, Potter DE |title=Bremazocine: a kappa-opioid agonist with potent analgesic and other pharmacologic properties |jo [[Category:Kappa agonists]]

...ahidi2006|Imanshahidi & Hosseinzadeh 2006]], p.&nbsp;430.</ref> a potent [[Kappa Opioid receptor|κ-opioid]] and [[D2 receptor|D₂ receptor]] [[ag ...salvinorin A is a potent and selective [[Kappa opioid receptor|κ-Opioid (kappa-Opioid) receptor]] [[agonist]].<ref name="Prisinzano2005p528" /><ref name="

* [[mu-Opioid receptor|μ]]-, [[delta-Opioid receptor|δ]]-, and [[kappa-Opioid receptor|κ]]-[[opioid receptor]] [[agonist]] (K_i = 1,280 [[Category:Sigma agonists]]

...B receptor cause [[absence seizures]] in high doses, as do GHB and GABA(B) agonists.<ref>{{cite journal |author=Banerjee PK, Snead OC |title=Presynaptic gamma- ...e]]. Dynorphin may play a role in the inhibition of dopamine release via [[kappa opioid receptor]]s.<ref>{{cite journal |author=Mamelak M |title=Gammahydrox