Cychlorphine

What Is Cychlorphine?

Cychlorphine, scientifically known as N-Propionitrile chlorphine, is an emerging novel synthetic opioid that has been linked to a growing number of fatal overdoses across the United States and Canada. The drug belongs to the piperidine benzimidazolone class of synthetic opioids, a family of compounds with roots in pharmaceutical research conducted in the 1960s and 1970s.

In vitro pharmacology data indicate that cychlorphine is approximately 10 times more potent than fentanyl, making even microscopic doses potentially lethal. The Center for Forensic Science Research and Education (CFSRE) issued a public alert in January 2026 warning of increasing fatal overdoses linked to this substance.

Statistic	Value	Description
Potency	10x	More potent than fentanyl
Fatal Overdoses in TN	30+	Since October 2025
US States with Detections	8+	Confirmed detections
Toxicology Cases	100+	At NMS Labs

Cychlorphine Street Names and Slang Terms

Cychlorphine is relatively new to illicit drug markets and does not yet have widely established street names. However, law enforcement and harm reduction organizations have documented the following terms associated with cychlorphine and related orphine-class compounds:

Name	Context
Cychlor	Shortened name used in forensic and law enforcement reports
Chlorphine	Reference to the parent compound; sometimes used interchangeably
Orphine	Generic term for the benzimidazolone opioid class (includes cychlorphine, spirochlorphine, brorphine)
Super fent	Slang referencing its potency relative to fentanyl (10x stronger)
White China	Street term occasionally applied to ultra-potent synthetic opioids in powder form

Important: Most users who consume cychlorphine do not know they are taking it. The drug typically enters the supply mixed into fentanyl, methamphetamine, or counterfeit prescription pills. Users may refer to it only by the name of the drug they believe they purchased.

Because cychlorphine is sold as an adulterant rather than a standalone product, dedicated street names are less common than for drugs like fentanyl or heroin. As the substance spreads, regional slang may develop.

Cychlorphine Chemical Classification & Pharmacology

N-Propionitrile chlorphine belongs to an emergent subclass of novel synthetic opioids referred to as "orphine analogues." It bears structural similarity to other benzimidazolones such as brorphine, chlorphine, and florphine.

These compounds trace their origins to pharmaceutical drug discovery conducted by Janssen Pharmaceutica, beginning with a 1967 patent describing a series of piperidine benzimidazolones.

Property	Cychlorphine	Fentanyl
Drug Class	Piperidine benzimidazolone	Phenylpiperidine
Receptor Affinity (Ki)	1.92 nM	6.29 nM
Relative Potency	~10x fentanyl	~50-100x morphine
Naloxone Responsiveness	Partial - may require multiple doses	Responsive

Cychlorphine Potency Comparison

Substance	Potency vs. Morphine	Class
Morphine	1x (baseline)	Natural opioid
Heroin	~2-5x	Semi-synthetic opioid
Fentanyl	~50-100x	Synthetic opioid
Cychlorphine	~500-1,000x	Benzimidazolone synthetic
Carfentanil	~10,000x	Synthetic opioid
Nitazenes	~500-4,000x	Benzimidazole synthetic

CRITICAL WARNING: At approximately 10 times the potency of fentanyl, even a few micrograms of cychlorphine can be lethal. The drug has been found mixed with fentanyl and methamphetamine in street samples.

Cychlorphine Timeline of Emergence

• 1967 - Janssen Pharmaceutica patents piperidine benzimidazolones
• April 2024 (Florida) - First reported in the US by a DEA laboratory
• September 2025 (Canada) - First detected in North America in Canada
• October-December 2025 (Tennessee) - Nine fatal overdoses in East Tennessee
• January 30, 2026 - CFSRE issues formal public alert
• February 5, 2026 - Knox County announces 16 deaths across eight East Tennessee counties
• February 2026 - Kentucky Homeland Security and UNODC issue global alerts
• March 2026 - Tennessee confirms 30+ statewide fatalities. Detections in 8 US states and 3 Canadian provinces

Cychlorphine Overdose Deaths & Case Data

Tennessee (Primary Epicenter)

The Knox County Regional Forensic Center initially reported 16 overdose deaths linked to cychlorphine in East Tennessee across eight counties. By mid-March 2026, the Tennessee Department of Health confirmed more than 30 fatal overdoses statewide since October 2025, with forensic experts noting the rate of deaths is doubling.

National & International Data

The CFSRE has identified N-Propionitrile chlorphine in 25 blood specimens from fatal overdoses, with specimens from 8 US states and 3 Canadian provinces. NMS Labs has tentatively identified cychlorphine in more than 100 toxicology cases.

Co-Detection with Other Substances

Cychlorphine was detected as the sole opioid in 11 of 25 CFSRE cases. In remaining cases it appeared alongside fentanyl, oxycodone, methamphetamine, cocaine, novel benzodiazepines (phenazolam), other orphine analogues (spirochlorphine), nitazene analogues, and carfentanil.

Cychlorphine Geographic Spread

State	Confirmed Activity
Tennessee	30+ fatal overdoses (epicenter); 8 East TN counties
Kentucky	Detected; Homeland Security public warning
Ohio	Gallia County Health Dept. overdose alert, March 2026
Illinois	Chicago drug seizures; DEA warning issued
Florida	First US DEA lab identification (April 2024)
California	Detected; state warning issued

Internationally, toxicology specimens have originated from 3 Canadian provinces, and the drug has been identified in Toronto's unregulated drug supply.

Cychlorphine Detection Challenges

Standard drug tests cannot identify cychlorphine. Most toxicology screenings used by hospitals, emergency responders, and law enforcement were designed to detect established drugs. Cychlorphine requires specialized, targeted testing.

Fentanyl test strips, a common harm reduction tool, will not detect cychlorphine. The UNODC issued a February 2026 alert noting implications for test strip usage.

Naloxone & Cychlorphine Treatment Response

Preclinical studies indicate that naloxone was not able to completely block the effects of chlorphine, suggesting potential limitations in standard overdose reversal treatment.

A peer-reviewed case in Clinical Toxicology (Vol. 64, No. 2, 2026) documented a non-fatal overdose: a 36-year-old male found unconscious, bradycardic (53 bpm) and hypothermic (36.3C). Law enforcement administered 4mg naloxone intranasally with only partial response. An additional 1mg was required before revival.

Emergency Protocol (TN Dept. of Health)

1. Administer naloxone immediately
2. Follow with rescue breathing for 2-3 minutes
3. If breathing not restored, administer additional naloxone
4. Repeat every 2-3 minutes until breathing restored or EMS arrives
5. Always call 911 immediately

How Cychlorphine Enters the Drug Supply

Cychlorphine is not a drug users typically seek out by name. It enters the illicit supply as an adulterant:

• Mixed with fentanyl - blended into powder, pills, and injectable forms
• Mixed with methamphetamine - exposing stimulant users to deadly opioid effects
• Counterfeit prescription pills - pressed pills resembling oxycodone (M30), Xanax, or others
• Powder and injectable forms - bulk powder for distribution and ready-to-inject solutions

Mixing Cychlorphine with Other Drugs

Combination	Risk Level	Mechanism
Cychlorphine + Alcohol	EXTREME	Combined respiratory depression, often fatal
Cychlorphine + Benzodiazepines	EXTREME	Amplified sedation and respiratory depression
Cychlorphine + Other Opioids	EXTREME	"Opioid stacking" overwhelms receptors
Cychlorphine + Stimulants	HIGH	Stimulant masks opioid sedation; delayed respiratory arrest
Cychlorphine + Gabapentin	HIGH	Enhanced opioid sedation

Is Cychlorphine Addictive?

Yes. Cychlorphine is a potent mu-opioid receptor agonist. Its Ki value (1.92 nM) indicates it binds to opioid receptors with approximately 3.3 times greater affinity than fentanyl (6.29 nM). The addiction liability is expected to be at least as severe as fentanyl.

How Opioid Addiction Develops

• Tolerance: The brain requires increasing doses. Cychlorphine's extreme potency means tolerance may develop rapidly at lower absolute doses
• Physical dependence: The brain becomes reliant on the external opioid for normal function
• Addiction (OUD): Compulsive drug-seeking despite harmful consequences. The brain's reward circuitry has been fundamentally altered

Cychlorphine Withdrawal Symptoms

Phase	Timeframe	Symptoms
Early Onset	8-24 hours	Anxiety, restlessness, muscle aches, insomnia, sweating
Peak	36-72 hours	Nausea, vomiting, diarrhea, cramping, rapid heartbeat, severe agitation
Subsiding	5-10 days	Symptoms decrease. Fatigue, irritability, sleep disturbances persist
Post-Acute (PAWS)	Weeks to months	Anxiety, depression, insomnia, drug cravings

Given cychlorphine's extreme potency, withdrawal may be more intense and unpredictable. Medical detoxification under professional supervision is strongly recommended.

Cychlorphine Long-Term Health Effects

Physical

• Chronic respiratory depression and hypoxic brain injury risk
• Hormonal disruption - suppressed testosterone, estrogen, cortisol
• Immunosuppression
• Gastrointestinal damage and bowel dysfunction
• Cardiovascular risk from repeated hypoxia
• Infectious disease risk (HIV, hepatitis) from injection use

Neurological & Psychological

• Cognitive impairment - attention, memory, executive function deficits
• Depression and anhedonia
• Hyperalgesia - paradoxical increased pain sensitivity

Cychlorphine Treatment: Medication-Assisted Treatment (MAT)

Medication	How It Works	Administration
Buprenorphine (Suboxone)	Partial agonist; reduces cravings without euphoria	Sublingual daily; monthly injection (Sublocade)
Methadone	Full agonist; stabilizes brain chemistry	Oral liquid daily at certified clinics
Naltrexone (Vivitrol)	Antagonist; blocks opioid effects completely	Monthly injection; requires full detox first

Note: Because cychlorphine binds with very high affinity (Ki = 1.92 nM), patients transitioning to buprenorphine may require careful induction protocols.

Cychlorphine Behavioral Therapies

• Cognitive Behavioral Therapy (CBT) - Identifies thought patterns leading to drug use
• Contingency Management - Tangible rewards for verified drug-free behavior
• Motivational Interviewing - Resolves ambivalence about treatment
• 12-Step Facilitation - Structured engagement with NA programs
• Dialectical Behavior Therapy (DBT) - Distress tolerance and emotional regulation

Cychlorphine Levels of Care (ASAM Criteria)

Level	Setting	Duration
4.0	Medically Managed Intensive Inpatient	Days to weeks
3.7	Medically Monitored Inpatient Detox	3-7 days
3.5	Residential/Inpatient Treatment	28-90 days
2.5	Partial Hospitalization (PHP)	2-4 weeks
2.1	Intensive Outpatient (IOP)	6-12 weeks
1.0	Outpatient	Ongoing

For cychlorphine-related addiction: most clinical experts recommend beginning at ASAM Level 3.7 (medically monitored detox) or higher.

Cychlorphine Legal Status

As of March 2026, cychlorphine does not appear on the DEA's official controlled substances schedules. However, it may be regulated under the Federal Analogue Act for substances "substantially similar" to scheduled drugs.

Cychlorphine Emergency Resources

Resource	Contact
Emergency Services	911
SAMHSA National Helpline	1-800-662-4357 (free, 24/7)
988 Suicide & Crisis Lifeline	Call or text 988
Poison Control	1-800-222-1222
Tennessee REDLINE	1-800-889-9789

Cychlorphine International Detections

Country	Status	Details
United States	30+ deaths	8+ states; Tennessee epicenter since Oct 2025
Canada	Detected Sept 2025	3 provinces; found in Toronto unregulated supply (CBC)
England	5+ deaths in 2025	Camden, London area (The Big Issue, Dec 2025)
Germany	Scheduled Dec 2025	Added to NpSG; detected in Karlsruhe area
Europe (5+ countries)	Reported since 2024	EUDA European Drug Report 2025

Cychlorphine has also been detected as the sole active opioid in counterfeit pharmaceutical pills designed to resemble hydromorphone or oxycodone, increasing the risk of accidental overdoses among users who believe they are consuming prescription medications.

Source: Wikipedia - Cychlorphine

Sources

• CFSRE Public Alert (January 30, 2026)
• CFSRE NPS Discovery Monograph - N-Propionitrile Chlorphine
• Clinical Toxicology, Vol. 64, No. 2, 2026. DOI: 10.1080/15563650.2025.2594070
• Tennessee Department of Health (March 18, 2026)
• Knox County Regional Forensic Center Press Release (February 5, 2026)
• Kentucky Health News (March 2, 2026)
• UNODC Alert (February 2026) - Increasing orphine analogues
• The Hill (March 2026)
• Addiction Center (March 2026)
• DSM-5-TR Opioid Use Disorder Diagnostic Criteria
• SAMHSA TIP 63 - Medications for Opioid Use Disorder
• NIDA - Effective Treatments for Opioid Addiction

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This guide is for educational purposes only and does not constitute medical or legal advice. Always consult a qualified healthcare professional. If you are experiencing an overdose emergency, call 911 immediately.

Published by United Rehabs | unitedrehabs.com | Last Updated: March 23, 2026