Cychlorphine (N-Propionitrile Chlorphine): An Emerging Benzimidazolone Synthetic Opioid and Its Implications for Overdose Recognition and Management.

Raffa RB, Breve F, Pergolizzi JV Jr, Vortsman E, Varrassi G.

J Pain Res. 2026 Jul 10;19:620907. doi: 10.2147/JPR.S620907. PMID: 42454006; PMCID: PMC13367459.