What is "proxorphan"

n. An opioid analgesic and antitussive drug of the morphinan family.

Proxorphan ( INN), also known as proxorphan tartate ( USAN) (developmental code name BL-5572M), is an opioid analgesic and antitussive drug of the morphinan family that was never marketed. It acts preferentially as a κ-opioid receptor partial agonist and to a lesser extent as a μ-opioid receptor partial agonist.