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| Formula | C23H25ClN4O |
| Molar mass | 408.93 g·mol−1 |
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Cychlorphine (N-Propionitrile chlorphine) is a chemical compound which has been sold as a designer drug, reported in five European countries since 2024, and in the USA. [1] It has been found in Canada as of September 2025. [2] It is similar in chemical structure to known opioid agonists such as brorphine and spirochlorphine, and is claimed to be an opioid with similar or slightly higher potency than fentanyl, but no pharmacological data for cychlorphine has been published. [3] [4] [5]
At least 5 people have died from a cychlorphine overdose in England in 2025. [6] Furthermore, it has been detected as the sole active opioid in fake pharmaceutical opioid preparations that are supposed to contain hydromorphone or oxycodone, further increasing the risk of accidental overdoses. [2]