Cyprodime is a selective opioid antagonist which blocks the μ-opioidreceptor, but without affecting the δ-opioid or κ-opioid receptors. This makes it useful for scientific research as it allows the μ-opioid receptor to be selectively deactivated so that the actions of the δ and κ receptors can be studied separately, in contrast to better known opioid antagonists such as naloxone which block all three opioid receptor subtypes.
^Schmidhammer H, Burkard WP, Eggstein-Aeppli L, Smith CF. Synthesis and biological evaluation of 14-alkoxymorphinans. 2. (−)-N- (cyclopropylmethyl)- 4,14-dimethoxymorphinan- 6-one, a selective mu opioid receptor antagonist. Journal of Medicinal Chemistry. 1989 Feb;32(2):418-21. PMID2536439
^Márki A, Monory K, Otvös F, Tóth G, Krassnig R, Schmidhammer H, Traynor JR, Roques BP, Maldonado R, Borsodi A. Mu-opioid receptor specific antagonist cyprodime: characterization by in vitro radioligand and [35S]GTPgammaS binding assays. European Journal of Pharmacology. 1999 Oct 27;383(2):209-14. PMID10585536