ST. LOUIS, MO – September 15, 2026 (STL.News) Drug Threat Notice – A powerful emerging synthetic opioid known as Cychlorphine has become a growing public-safety threat in the United States, prompting warnings from federal authorities, international drug-monitoring agencies, and forensic toxicologists. Cychlorphine, formally known as N-propionitrile chlorphine, is a synthetic opioid belonging to a group of substances known as orphine analogs, or brorphine-like opioids. It is chemically distinct from both fentanyl and nitazenes, but laboratory research indicates that cychlorphine can be more potent than fentanyl and capable of producing profound respiratory and cardiovascular depression. The threat has developed rapidly.

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