Most people have heard warnings about fentanyl for years.
Those warnings have shaped how emergency rooms, pharmacists and families think about overdose risk. Now federal officials say something new is moving through the same supply.
The White House Office of National Drug Control Policy has issued a drug threat notice about cychlorphine, an emerging synthetic opioid.
According to the National Association of Boards of Pharmacy, which summarized the notice, cychlorphine may be up to 10 times more potent than fentanyl. It has been linked to at least 55 deaths across the United States between 2025 and 2026.
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Cychlorphine, also known as N-propionitrile chlorphine, is not a fentanyl derivative. It belongs to a newer chemical family called orphines. That distinction matters for how doctors have to respond in an overdose.
Why the drug is so hard to spot
The most alarming feature is how easily cychlorphine slips through normal safety checks.
It does not show up on the fentanyl test strips that harm-reduction groups hand out. It also does not appear on the routine opioid urine screens that emergency rooms use when a patient arrives unresponsive.
That means a person can be under the effect of a powerful opioid while a hospital test reads negative. Confirming cychlorphine takes specialized toxicology work in a laboratory.
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Naloxone, the overdose reversal drug sold under brand names such as Narcan, still works. But because cychlorphine is so potent, officials warn that more than one dose may be needed to bring someone back.
Where the drug has turned up
Detections have jumped sharply. In 2024, cychlorphine appeared in a single US drug sample. In 2025, it turned up in 106 samples across 10 states, spanning all four US Census regions.
The highest concentrations have been reported in Ohio, Texas and Tennessee.
According to Discover Magazine, the drug has been found on its own and mixed with other substances, including fentanyl, oxycodone, cocaine and methamphetamine.
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What to do in a suspected overdose
Federal guidance is unchanged in the basics. Call 911 immediately, give naloxone if available, and stay with the person until help arrives. Be ready to give a second dose if the first does not restore breathing.
The signs of a cychlorphine overdose match those of any strong opioid. They include slow or stopped breathing, unresponsiveness, blue or gray lips and fingernails, pinpoint pupils, and choking or gurgling sounds.
The Addiction Policy Forum notes that a negative fentanyl test strip does not rule out opioid exposure when cychlorphine may be involved. Anyone concerned about drug use in their household should speak with a doctor or a local harm-reduction service.
The ONDCP issued its notice in April 2026.
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This article is made and published by Ida-Marie Palm Varbæk, who may have used AI in the preparation.