A synthetic opioid that most people have never heard of has been linked to at least 122 deaths in the United States since July 2025. The drug, called cychlorphine, is not fentanyl, but federal officials say it may be up to ten times stronger. In April, the White House Office of National Drug Control Policy (ONDCP) named it an “emerging drug threat.”
The death toll is still small compared with fentanyl, which remains the main driver of opioid overdoses. What worries public health experts is how quickly cychlorphine is appearing, how hard it is to detect, and how little most people know about it.
Last updated: October 27, 2026
What is cychlorphine?
Cychlorphine belongs to a relatively new family of lab-made opioids known as orphines. According to Dr. Nabarun Dasgupta, a street drug researcher at the University of North Carolina at Chapel Hill, these compounds have never been used as medicines. The drug has no approval from the US Food and Drug Administration for any medical use.
Researchers at UNC first detected it in the United States in August 2024. European scientists had seen drugs from the same family since 2019 and had been watching for them to reach North America. Like other opioids, cychlorphine acts on the body’s opioid receptors, which is why it can cause sedation and slowed or stopped breathing.
How quickly has it spread?
The ONDCP issued its first-ever Drug Threat Notice about cychlorphine on April 30. At that point, officials had linked the drug to at least 55 deaths nationwide, including 41 in Tennessee between July 2025 and February 2026. The notice said the drug had turned up in every region of the country, with clusters in Tennessee, Ohio and Texas.
The ONDCP also reported that cychlorphine appeared in 106 drug samples from 10 states in 2025, up from a single sample the year before. By late October, a CNN report put the number of linked deaths at 122 or more. Louisiana officials have separately reported at least two deaths connected to the drug since December 2025.
In August, the Drug Enforcement Administration placed cychlorphine in Schedule I on a temporary basis, which makes it illegal to make, possess or sell in the United States.
Why is it so hard to detect?
This is the part of the story that concerns doctors and medical examiners most. The ONDCP warned that cychlorphine is not picked up by standard drug test strips or by the routine opioid urine screens that hospitals use. Finding it requires specialized laboratory testing.
That has two consequences. First, an overdose may go unrecognized in an emergency room. Second, the number of deaths is probably higher than the official count. An editorial in the Journal of Pain Research, led by Temple University pharmacology professor emeritus Robert Raffa, made the same point about undercounting.
The drug has also been found in counterfeit prescription pills and in powders, and it has been detected alongside other substances such as fentanyl, methamphetamine and cocaine. In other words, people may be exposed without knowing it is in what they are taking.
What are the health risks, and what should people know?
Dr. Shravani Durbhakula, who directs the comprehensive pain service at Vanderbilt University, explains that because cychlorphine is an opioid, it can cause respiratory depression, the dangerous slowing or stopping of breathing. It can also cause sedation, euphoria, reduced consciousness and unresponsiveness.
The encouraging news is that the symptoms of an opioid overdose can be reversed with naloxone, the medication sold as Narcan. The ONDCP advises first responders and the public to keep extra naloxone on hand and to call emergency services immediately if an overdose is suspected. Many US pharmacies and community health programs provide naloxone, and public health agencies encourage families and community groups to learn how to recognize an overdose.
Keeping the threat in perspective
It is important not to overstate the problem. Dasgupta describes cychlorphine cases in the United States as sporadic, appearing far less often than fentanyl in tested samples, and fentanyl is still responsible for the large majority of synthetic opioid deaths. The concern is less about the drug’s current scale and more about its trajectory, and about the pattern it follows. New synthetic opioids tend to appear first in small numbers, spread quietly, and only become visible after deaths start to accumulate.
What happens next?
The ONDCP says its Emerging Drug Threats team will keep monitoring cychlorphine and other new synthetic substances. Experts quoted in recent reports recommend more public education, wider naloxone distribution and expanded laboratory testing, so that health officials can find these drugs earlier and track them more accurately.
Frequently asked questions
What is cychlorphine?
It is a synthetic opioid from the orphine family. It is not a form of fentanyl and has no approved medical use.
Is cychlorphine stronger than fentanyl?
The ONDCP says it may be up to 10 times stronger than fentanyl, though its potency in real-world street products can vary.
Can drug test strips detect cychlorphine?
No. Standard fentanyl test strips and routine hospital opioid urine screens do not detect it. Specialized laboratory testing is needed.
Is cychlorphine illegal in the United States?
Yes. The DEA placed it in Schedule I on a temporary basis in August 2026.
If you or someone you know needs help with substance use, the US SAMHSA National Helpline is available at 1-800-662-4357. In an emergency, call your local emergency number right away.
Sources: CNN (via LocalNews8), Homeland Security Today, HealthDay via US News and NTD.
This article is for general information only and is not medical advice.
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