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...Naloxone also has an antagonist action, though with a lower affinity, at [[kappa Opioid receptor|κ-]] (KOR) and [[delta Opioid receptor|δ-opioid receptors [[Category:Kappa antagonists]]

...er in the intensity and length of each, and weak opioids and mixed agonist-antagonists may have acute withdrawal syndromes which do not reach the highest level. A ...analgesia,<ref>{{cite journal |author=Chien CC, Pasternak GW |title=Sigma antagonists potentiate opioid analgesia in rats |journal=Neurosci. Lett. |volume=190 |i

...], and competitive [[competitive antagonist|antagonist]] activity at the [[kappa opioid receptor|κ-opioid receptor]]. Buprenorphine [[hydrochloride]] was f ...] for the [[Mu opioid receptor|μ receptor]] such that [[opioid receptor]] antagonists (e.g. [[naloxone]]) only partially reverse its effects. These two [[chemica

...ahidi2006|Imanshahidi & Hosseinzadeh 2006]], p.&nbsp;430.</ref> a potent [[Kappa Opioid receptor|κ-opioid]] and [[D2 receptor|D₂ receptor]] [[ag ...lvinorin A in mice are blocked by κ-Opioid receptor [[receptor antagonist|antagonists]].<ref name="Zhang2005pabs">[[#refZhang2005|Zhang et al. 2005]], p.&nbsp;ab

...agonists--S(+)-ketamine, dextrorphan, and dextromethorphan--act as calcium antagonists on bovine cerebral arteries | journal = Journal of Neurosurgical Anesthesio * [[mu-Opioid receptor|μ]]-, [[delta-Opioid receptor|δ]]-, and [[kappa-Opioid receptor|κ]]-[[opioid receptor]] [[agonist]] (K_i = 1,280

...7.016 |url=}}</ref> GHB's sedative effects are blocked by GABA_B antagonists. ...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