Cychlorphine: What to Know About the Emerging Synthetic Opioid in Tennessee
Cychlorphine is an emerging, highly potent synthetic opioid that has been detected in Tennessee overdose deaths, wastewater, counterfeit pills, and the broader illicit opioid supply. People may be exposed without knowingly seeking cychlorphine because emerging synthetic opioids can appear alongside fentanyl and other substances.
On March 18, 2026, the Tennessee Department of Health reported that more than 30 fatal overdoses statewide since October 2025 had been associated with cychlorphine. TDH also described the emerging synthetic opioid as approximately 10 times more potent than fentanyl.
For people who use opioids, the concern is not simply whether cychlorphine becomes a drug people recognize by name. Its emergence shows how quickly the illicit opioid supply can change and how difficult it can be to know what a counterfeit pill or illicit powder actually contains. A July 2026 peer-reviewed study detected cychlorphine in East Tennessee wastewater, while the DEA has warned that emerging synthetic substances may be hidden in fentanyl powder and counterfeit pills.
Cychlorphine by the Numbers
Recent government surveillance and scientific research show why cychlorphine has quickly become an emerging public-health concern.
The United Nations Office on Drugs and Crime reported in May 2026 that cychlorphine had been reported by 10 countries and had become the most commonly reported member of the emerging orphine-analogue group.
What Is Cychlorphine?
Cychlorphine, also known as N-propionitrile chlorphine or cyanoethyl chlorphine, is a novel synthetic opioid. The UNODC Early Warning Advisory categorizes cychlorphine among emerging orphine analogues.
Because cychlorphine is relatively new to the illicit drug supply and scientific literature, terminology used to describe its chemical family can vary among toxicology, public-health, and early-warning sources. A 2026 peer-reviewed clinical review describes cychlorphine as a benzimidazolone synthetic opioid within the orphine analogue subclass.
What is more firmly established is its opioid activity and overdose risk. Available pharmacological evidence indicates activity at the mu-opioid receptor, the same receptor system involved in the effects of fentanyl, heroin, and other opioids. Cychlorphine is not a fentanyl analogue or a nitazene.
Why Is Cychlorphine Considered an Emerging Drug?
Calling cychlorphine an emerging drug does not necessarily mean large numbers of people are deliberately seeking it by name.
The term reflects its relatively recent appearance and increasing detection in drug seizures, toxicology investigations and overdose deaths.
UNODC reported in May 2026 that cychlorphine’s presence in illicit markets had increased since 2024, particularly in North America. By that point, it had been identified in 182 reported drug seizures and 78 fatal overdose cases.
The broader orphine category is also expanding. In February 2026, UNODC reported that 11 orphine analogues had been identified across 14 countries, with nine of those analogues first reported during 2024 and 2025.
Cychlorphine is therefore part of a broader shift in the synthetic-opioid market rather than an isolated new substance.
Why Are Tennessee Officials Warning About Cychlorphine?
Tennessee has become an important location in understanding the emergence of cychlorphine in the United States.
On March 2, 2026, Tennessee Lookout reported that cychlorphine had been identified in 19 overdose deaths in East Tennessee, including 12 confirmed cases and seven awaiting laboratory confirmation at that time.
Just over two weeks later, TDH expanded the picture statewide, announcing that more than 30 fatal overdoses since October 2025 had been associated with cychlorphine.
“Cychlorphine is a synthetic opioid, 10 times more potent than fentanyl.”
Tennessee Department of Health, March 18, 2026TDH also reported that fentanyl had been associated with more than 1,633 fatal Tennessee overdoses in 2024, based on provisional state data.
Cychlorphine Is Not Limited to Tennessee
Tennessee has played an important role in identifying the emerging cychlorphine threat, but the substance is not confined to the state. A July 2026 peer-reviewed clinical review reported that, as of March 2026, at least 24 states had reported overdoses or deaths linked to cychlorphine, with detections also described in states including Kentucky, Ohio, Illinois, California, and Texas.
The same review notes that cychlorphine has often been identified in a polydrug context with substances such as fentanyl, oxycodone, methamphetamine, cocaine, novel benzodiazepines, nitazene analogues, and carfentanil. That makes overdose recognition and treatment more complicated because a person may be exposed to several substances at once.
For people using illicit opioids, the practical concern remains the same: the contents and potency of a pill or powder may be different from what the person believes they obtained.
Cychlorphine in East Tennessee Wastewater
A peer-reviewed study published in July 2026 analyzed wastewater collected from 12 catchment areas in East Tennessee.
The researchers detected cychlorphine in seven wastewater samples and quantified it in four samples from one rural community located along Interstate 75.
The average measured concentration in those samples was 8.69 ± 1.60 nanograms per liter. Population- and flow-normalized mass loads ranged from 2.61 to 5.48 mg per day per 1,000 people.
The researchers described the findings as the first published evidence of cychlorphine occurring in wastewater and suggested that wastewater-based epidemiology could potentially function as an early-warning tool for emerging synthetic opioids.
How Are People Being Exposed to Cychlorphine?
Available evidence indicates that people may encounter cychlorphine without intentionally seeking it by name.
On May 12, 2026, the U.S. Drug Enforcement Administration issued a public-safety advisory warning that illicit fentanyl was increasingly being combined with emerging substances including cychlorphine, nitazenes, xylazine and medetomidine.
“These substances are frequently mixed into counterfeit pills or fentanyl powder without the user’s knowledge.”
U.S. Drug Enforcement Administration, May 12, 2026That means someone does not necessarily have to find a person specifically selling cychlorphine. They may believe they are obtaining fentanyl, heroin or a familiar prescription-style pill and instead receive a product containing cychlorphine or several substances.
Where Has Cychlorphine Been Found?
Counterfeit Pills
UNODC reports cychlorphine in falsified pharmaceutical tablets represented as Xanax, Percocet, Dilaudid and OxyContin.
Fentanyl
DEA and UNODC reporting identifies cychlorphine in connection with fentanyl and fentanyl analogues. Learn more about fentanyl addiction treatment in Murfreesboro.
Heroin
UNODC has reported cychlorphine in drug samples involving heroin and other opioids. Tulip Hill Recovery also provides heroin addiction treatment in Murfreesboro.
Cocaine and Other Drugs
Cychlorphine has also been detected in samples involving cocaine and other substances. This illustrates the unpredictability of illicit drug mixtures.
Cychlorphine and Counterfeit Prescription Pills
Counterfeit pills are particularly concerning because they can create a false sense of familiarity.
A tablet may look like oxycodone, Percocet, Xanax or another prescription medication while containing completely different substances. Someone repeatedly using counterfeit opioid pills may develop opioid dependence or opioid use disorder even when the actual ingredients change from one pill to the next. People struggling with counterfeit pills or other drug use can also learn about drug addiction treatment in Murfreesboro.
UNODC reports that cychlorphine has been identified in falsified pharmaceuticals represented as Xanax, Percocet, Dilaudid and OxyContin.
Does Cychlorphine Have a Street Name?
There does not currently appear to be a widely established street name for cychlorphine in major public-health or law-enforcement reporting.
Official sources generally identify the drug as cychlorphine, N-propionitrile chlorphine or cyanoethyl chlorphine.
The lack of a recognizable street name makes sense in the context of the current threat. Someone exposed to cychlorphine may believe they purchased fentanyl, heroin or a prescription-style opioid rather than knowingly purchasing cychlorphine.
What Does Cychlorphine Look Like?
There is no reliable way to identify cychlorphine simply by looking at an illicit drug.
UNODC has reported cychlorphine and related orphine analogues in multiple drug forms, particularly powders and tablets.
Cychlorphine vs. Fentanyl
Cychlorphine and fentanyl are both potent synthetic opioids, but they are chemically different substances. Fentanyl is already a major contributor to opioid overdoses in the United States, while cychlorphine is a newer emerging orphine analogue that has recently appeared in Tennessee and other parts of North America.
People struggling with fentanyl use can learn more about fentanyl addiction treatment in Murfreesboro, while those affected by heroin, prescription painkillers, fentanyl or other opioids can explore Tulip Hill Recovery’s broader opioid addiction treatment program.
| Characteristic | Cychlorphine | Fentanyl |
|---|---|---|
| Drug type | Synthetic opioid and orphine analogue | Potent synthetic opioid |
| Current context | Newly emerging opioid increasingly identified in North America | Major established contributor to the U.S. opioid overdose crisis |
| Potency | TDH describes cychlorphine as approximately 10 times more potent than fentanyl | Extremely potent opioid associated with respiratory depression and overdose |
| Illicit drug supply | Detected alongside fentanyl, heroin, cocaine, counterfeit pills and other substances | Frequently found in illicit powders and counterfeit prescription pills |
| Naloxone | Naloxone can reverse opioid effects, although repeat dosing may be necessary | Naloxone can reverse fentanyl overdose, and multiple doses may sometimes be required |
Cychlorphine, Nitazenes and the Changing Synthetic Opioid Supply
Cychlorphine is not the only emerging synthetic opioid being monitored.
UNODC reported in February 2026 that 34 nitazene analogues had been reported across at least 37 countries.
“Today’s illicit drug supply is more dangerous, more deceptive, and more deadly than ever before.”
U.S. Drug Enforcement Administration, May 12, 2026Can Drug Tests Detect Cychlorphine?
UNODC reports that orphine analogues are not detected by fentanyl or nitazene test strips.
UNODC also reports that cychlorphine is not expected to be detected by routine opioid urine screens, meaning specialized laboratory analysis may be necessary.
What Does a Cychlorphine Overdose Look Like?
Unresponsiveness
The person cannot be awakened or does not respond normally to voice or touch.
Slow Breathing
Breathing may become unusually slow, shallow or difficult to detect.
Breathing Stops
Severe opioid poisoning can stop breathing entirely and requires immediate emergency intervention.
Blue or Purple Coloring
Blue or purple lips or fingernails can indicate dangerously low oxygen levels.
Does Narcan Work on Cychlorphine?
Yes. Naloxone can reverse cychlorphine’s opioid effects.
The Tennessee Department of Health states that naloxone is effective with cychlorphine, although repeat dosing may be necessary.
Emergency medical care is still necessary even when someone responds to naloxone.
Can Cychlorphine Cause Addiction?
Cychlorphine acts on opioid receptors and is a highly potent opioid, but human research specifically documenting cychlorphine dependence, addiction and withdrawal remains limited.
The larger concern involves the broader illicit opioid supply. Someone repeatedly using fentanyl, heroin, counterfeit pills or other opioids may develop opioid use disorder even if they do not know cychlorphine is present.
Because cychlorphine may appear alongside other opioids, readers may also want to learn about fentanyl addiction treatment, heroin rehab, and broader drug addiction treatment at Tulip Hill Recovery.
Why the Lack of a Street Name Matters
Cychlorphine demonstrates how an emerging drug can spread through illicit markets without developing a recognizable street identity.
Someone may believe they purchased fentanyl. Someone else may believe they obtained oxycodone or Percocet. Another person may encounter an unexpected opioid in a product sold as something else.
The DEA’s warning that emerging synthetics may be hidden in fentanyl powder and counterfeit pills explains why cychlorphine does not need a recognizable street name to contribute to fatal overdoses.
What Tennessee Families Should Know
Counterfeit Pills Are Unpredictable
A pill resembling a legitimate medication may contain fentanyl, cychlorphine or another unexpected substance.
Appearance Is Not Enough
Color, shape and markings cannot reliably establish what an illicit drug contains.
Testing Has Limits
Current fentanyl and nitazene test strips do not identify every emerging opioid.
Naloxone Still Matters
TDH confirms naloxone is effective against cychlorphine’s opioid effects, although additional doses may be needed.
Treatment for Opioid Addiction in Tennessee
You do not need to know whether cychlorphine, fentanyl, heroin, or another synthetic opioid was present in the drugs you used before seeking help. Treatment decisions are based on symptoms, opioid-use history, withdrawal risk, physical health, mental health needs, previous treatment experiences, and recovery goals.
For someone who has developed opioid dependence, suddenly stopping use can cause significant withdrawal symptoms and intense cravings. When withdrawal or medical stabilization is a concern, professional evaluation can help determine whether drug detox and stabilization should come before ongoing outpatient treatment.
After stabilization, opioid addiction treatment in Murfreesboro may include structured therapy, medication-assisted treatment when clinically appropriate, dual diagnosis care, relapse-prevention planning, family support, and continued recovery services. The appropriate level of care depends on the individual rather than the specific name of the opioid found in the drug supply.
Partial Hospitalization Program
PHP provides structured daytime clinical treatment, therapy and recovery support.
Intensive Outpatient Program
IOP offers structured addiction treatment while allowing clients to maintain more of their everyday routine.
Dual Diagnosis Treatment
Dual diagnosis treatment addresses substance use and co-occurring mental health conditions together.
Aftercare and Recovery Support
Aftercare supports relapse prevention, continued therapy and long-term recovery planning.
Related Opioid Treatment Resources
If cychlorphine exposure is connected to ongoing fentanyl, heroin, counterfeit pill or other opioid use, these Tulip Hill Recovery resources can help explain treatment options and next steps.
Cychlorphine and Tennessee: The Bottom Line
Cychlorphine illustrates how rapidly the opioid crisis continues to evolve.
The greatest concern is not necessarily that large numbers of people are deliberately seeking cychlorphine. Instead, an extremely potent synthetic opioid is appearing within an illicit drug supply where people may not know exactly what they are taking.
Tennessee health officials have associated cychlorphine with more than 30 fatal overdoses since October 2025. DEA has warned about its presence alongside fentanyl and counterfeit pills. UNODC has documented increasing international detections. And 2026 research detected cychlorphine in East Tennessee wastewater.
The contents and potency of illicit drugs are increasingly difficult to predict.
Frequently Asked Questions About Cychlorphine
What is cychlorphine?
Cychlorphine is a potent synthetic opioid belonging to the orphine-analogue family.
Is cychlorphine stronger than fentanyl?
The Tennessee Department of Health describes cychlorphine as approximately 10 times more potent than fentanyl.
How many cychlorphine deaths have occurred in Tennessee?
TDH reported in March 2026 that more than 30 fatal overdoses statewide since October 2025 had been associated with cychlorphine.
How are people getting cychlorphine?
People may encounter cychlorphine without intentionally seeking it. DEA and UNODC reporting indicate it has appeared alongside fentanyl, counterfeit pills and other illicit substances.
Does cychlorphine have a street name?
There does not currently appear to be a widely established street name documented by major public-health or law-enforcement sources.
Can counterfeit pills contain cychlorphine?
Yes. UNODC has reported cychlorphine in falsified pharmaceuticals represented as Xanax, Percocet, Dilaudid and OxyContin.
Can fentanyl test strips detect cychlorphine?
UNODC reports that orphine analogues are not detected by fentanyl or nitazene test strips.
Has cychlorphine been found in Tennessee wastewater?
Yes. A 2026 peer-reviewed study detected cychlorphine in seven wastewater samples collected from East Tennessee.
Does Narcan work on cychlorphine?
Yes. TDH states that naloxone can reverse cychlorphine’s opioid effects, although repeat dosing may be necessary.
What are the signs of a cychlorphine overdose?
Because cychlorphine is an opioid, overdose can involve severe sleepiness or unresponsiveness, very slow or stopped breathing, and blue or purple lips or fingernails. A suspected opioid overdose is a medical emergency. Call 911 and administer naloxone when available.
Can cychlorphine cause addiction?
Cychlorphine is a potent opioid, but human research specifically characterizing cychlorphine addiction and withdrawal remains limited. People using illicit opioids can still develop opioid use disorder regardless of whether they know cychlorphine is present.
Sources and References
This article was developed using current government guidance, public-health surveillance data, peer-reviewed research, and recent reporting related to cychlorphine and the changing synthetic-opioid supply.
Burley, B. (2026, March 2). New synthetic opioid linked to 19 Tennessee deaths exposes limits in detection and legal clarity. Tennessee Lookout.
Subedi, B., Sapkota, R., & Phillips, D. H. (2026). Early warning from wastewater: Detection of emerging opioid cychlorphine in rural Tennessee. Environmental Science & Technology Letters, 13(8), 1064–1070. https://doi.org/10.1021/acs.estlett.6c00529
Tennessee Department of Health. (2026, March 18). TDH reinforces importance of naloxone with rise in cychlorphine fatalities. State of Tennessee.
United Nations Office on Drugs and Crime. (2026, February 25). Increasing nitazene and orphine analogues and implications for test strips. Early Warning Advisory on New Psychoactive Substances.
United Nations Office on Drugs and Crime. (2026, May 14). The emerging threat of cychlorphine: A new synthetic opioid raising concerns globally for public health. Early Warning Advisory on New Psychoactive Substances.
United Nations Office on Drugs and Crime. (n.d.). Cychlorphine: Substance details. Early Warning Advisory on New Psychoactive Substances.
Raffa, R. B., Breve, F., Pergolizzi, J. V., Jr., Vortsman, E., & Varrassi, G. (2026). Cychlorphine (N-propionitrile chlorphine): An emerging benzimidazolone synthetic opioid and its implications for overdose recognition and management. Journal of Pain Research, 19, 620907. https://doi.org/10.2147/JPR.S620907
U.S. Drug Enforcement Administration. (2026, May 12). Public safety advisory: Heightened threat: Fentanyl mixed with emerging synthetic drugs. U.S. Department of Justice.
