出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/06/16 19:42 UTC 版)
Levallorphan (Lorfan, Naloxiphan) is a drug of the morphinan family which is used as an opioid antidote or antagonist. It acts as an antagonist on μ-opioid receptor and agonist on kappa receptors [hence called [partial agonist]], (Reference : p 602, Goodman & Gilman's The Pharmacological Basis of Therapeutics, ed. 10 from McGraw Hill Medical Publishing Division)and as a result, blocks the effects of stronger agents with greater intrinsic activity such as morphine or endogenous β-endorphin.