Slow Dissociation of Nitazenes from the 𝜇-Opioid Receptor Underlies the Challenge of Overdose Reversal

Nitazenes are driving a wave of overdose deaths in the United States and Europe and of-ten require additional doses of naloxone to reverse. To understand the molecular basis, we conducted a joint experimental and simulation study of three common nitazenes, eto-, etodes- , and protonitazene. Radioligand experiments demonstrated that all three nitazenes display higher receptor affinity and longer dissociation half-lives than fentanyl. Notably, protonitazene dissociates slower than carfentanil and its displacement requires fourfold higher antagonist con-centrations. The observed trend in nitazene half-lives is recapitulated by molecular dynamics simulations, which suggest that kinetics is controlled by specific interactions with two receptor subpockets. A newly published cryo-EM structure of fluetonitazene- 𝜇OR complex confirms the predicted interactions, including a 𝜋-hole bond between the nitro group and Tyr 1.39, a residue recently shown to modulate 𝜇OR signaling bias. Our findings suggest slow receptor dissocia-tion as a key factor challenging overdose reversal. The mechanistic insights have implications for understanding opioid toxicity and designing more effective countermeasures.