Nalorphine

Nalorphine (INN, also known as N-allyl-normorphine) trade names Lethidrone and Nalline. Nalorphine acts at two opioid receptors, at the mu receptor it has antagonistic effects and at the kappa receptors it exerts agonistic characteristics. It is used to reverse opioid overdose and (starting in the 1950s) in a challenge test to determine opioid dependence.