One of the newest drugs raising concern among toxicologists, public health officials, and law enforcement is cychlorphine. This highly potent synthetic opioid has increasingly been linked to counterfeit pills and overdose deaths.
Also known as N-propionitrile chlorphine, cychlorphine belongs to a group of synthetic opioids sometimes called orphines. Although research on the drug is still so limited, available evidence suggests that cychlorphine can cause severe opioid effects, including but not limited to dangerous respiratory depression and overdose.
Concern surrounding the drug has grown incredibly quickly. As of early 2026, federal data associated cychlorphine with at least 55 deaths in the United States and documented the substance in 225 law-enforcement seizures across multiple jurisdictions.
On August 27, 2026, the Drug Enforcement Administration (DEA) temporarily placed cychlorphine and several related synthetic opioids into Schedule I of the Controlled Substances Act.
What Is Cychlorphine?
Cychlorphine is a novel synthetic opioid that acts as an agonist at the mu-opioid receptor (MOR), the same receptor system responsible for many of the effects associated with substances such as heroin, oxycodone, and other opioids.The drug is part of the piperidine benzimidazolones, or ‘orphine’ family of synthetic opioids. The Center for Forensic Science Research and Education (CFSRE) first identified N-propionitrile chlorphine in its laboratory in 2024. Since then, detections have expanded throughout the United States and even internationally.
How Strong Is Cychlorphine?
How cychlorphine's potency translates to humans is still being studied.But CFSRE suggests that cychlorphine is approximately 10 times more potent than fentanyl in certain pharmacological testing. However, human pharmacology data remains extremely limited, so potency comparisons should not be interpreted as precise dose equivalents. This uncertainty is itself dangerous.
As it’s an emerging synthetic drug, there’s little reliable information about it. But it’s vital to understand that there is no established safe illicit dose of cychlorphine.
Cychlorphine In Street Drugs
When one substance becomes controlled or more difficult to manufacture, chemically different substances may begin appearing in its place. CFSRE has identified cychlorphine as part of a broader emergence of orphine opioids following changes in the availability and regulation of other synthetic opioids.What’s especially concerning is that many people are exposed to cychlorphine without intentionally seeking it out.
Drug-checking programs have identified cychlorphine in counterfeit tablets sold as prescription medications. Toronto's Drug Checking Service, for example, found cychlorphine in counterfeit pills expected to contain Oxycodone, Percocet, and Hydromorphone.
In several samples, cychlorphine was the only drug detected instead of the medication the person believed they had obtained. Opioids, stimulants, and benzos obtained off the street are all at risk of containing cychlorphine, unfortunately.
The United Nations Office on Drugs and Crime (UNODC) has also reported cychlorphine in falsified pharmaceuticals resembling Xanax, OxyContin, Dilaudid, and other pills, as well as in samples containing fentanyl, heroin, cocaine, and medetomidine.
These things are what make counterfeit pills bought off the street so dangerous. A pill's appearance cannot reliably show what substances are actually inside it, and you can’t take a drug dealer’s word for what the pill really is.
Can Drug Tests Detect Cychlorphine?
Cychlorphine presents another problem; routine drug testing may not detect it. Standard opioid urine screens are designed to identify specific substances or metabolites and may miss newer synthetic opioids.A 2026 medical case demonstrates this challenge. A woman in her 20s experienced unresponsiveness and respiratory depression after taking what she believed was the benzodiazepine alprazolam. Her initial opioid and fentanyl urine screens were all negative. But more advanced toxicology testing later identified cychlorphine in her blood.
UNODC has similarly warned that cychlorphine is not expected to be detected by standard drug test strips or routine opioid urine screens.
It’s important to note that a negative fentanyl test does not mean an illicit pill or powder is free from other powerful synthetic opioids.
What Are the Effects of Cychlorphine?
Because controlled human studies are limited, researchers do not yet have a full picture of cychlorphine's effects.Based on its activity at mu-opioid receptors and documented overdose cases, potential opioid effects may include:
- Sedation or drowsiness
- Euphoria
- Pain relief
- Constricted or pinpoint pupils
- Slowed breathing
- Reduced consciousness
- Confusion
- Nausea or vomiting
- Loss of consciousness
Cychlorphine Overdose
A cychlorphine overdose may look similar to an overdose involving other opioids like fentanyl or morphine.Signs of overdose may include:
- Very slow, irregular, or stopped breathing
- Inability to wake the person
- Extreme sedation or unconsciousness
- Constricted or pinpoint pupils
- Blue, gray, or pale lips or skin
- Choking, snoring, or gurgling sounds
- Limpness
- Slow heartbeat
Naloxone (Narcan) can reverse opioid-induced respiratory depression and should still be used when cychlorphine exposure is suspected. Because highly potent synthetic opioids may require additional naloxone, repeat doses may be necessary while emergency services are on the way.
The first published biologically confirmed nonfatal cychlorphine overdose involved a patient who received 6 mg of intranasal naloxone before arriving at the emergency department and demonstrated a naloxone-responsive opioid overdose syndrome.
Do not assume naloxone will not work simply because the opioid involved is unfamiliar or synthetic. Narcan saves lives!
Is Cychlorphine Addictive?
Although there is not yet substantial human research specifically examining long-term, or even short-term, cychlorphine use, its strong activity at mu-opioid receptors means dependence and addiction are serious concerns.Repeated exposure to opioids can cause the brain and body to adapt to the presence of the substance. Over time, many continue to use opioids to simply avoid the horrible withdrawal symptoms.
Potential signs of opioid dependence can include:
- Cravings
- Increased tolerance
- Using more frequently
- Difficulty reducing or stopping use
- Continued use despite consequences
- Experiencing withdrawal when use decreases or stops
What Is Cychlorphine Withdrawal Like?
There is currently very little clinical research specifically describing cychlorphine withdrawal, including its exact onset, duration, and severity.Because cychlorphine activates mu-opioid receptors, withdrawal would be expected to share characteristics with withdrawal from other opioids.
Cychlorphine withdrawal symptoms could include:
- Anxiety or agitation
- Restlessness
- Sweating
- Runny nose
- Watery eyes
- Yawning
- Muscle and joint aches
- Abdominal cramping
- Nausea or vomiting
- Diarrhea
- Insomnia
- Increased heart rate
- Elevated blood pressure
- Strong cravings
With all of that said, predicting withdrawal is substantially more difficult than with most other substances.
Why Self-Detox From Cychlorphine Can Be Risky
Trying to manage withdrawal by yourself can create countless problems and concerns.One major concern is that a person may not actually know what they have been taking. Products containing cychlorphine have also contained fentanyl, xylazine, and other drugs. This matters because withdrawal risks vary significantly by substance, especially when there’s overlap.
Another danger occurs after detoxing yourself. Opioid tolerance can decrease quickly after stopping use. Returning to your previously tolerated amount can then result in overdose. At The Coleman Institute, we commonly recommend Vivitrol as part of a patient’s aftercare plan for relapse prevention.
With an opioid as potent and unpredictable as cychlorphine, a comprehensive medical evaluation can help determine the best next step.
Is Cychlorphine Illegal?
Yes. Cychlorphine is currently a federally controlled Schedule I substance in the United States.On July 1, 2026, the DEA announced its intent to temporarily schedule cychlorphine along with SR-14968, SR-17018, and spirochlorphine. They stated that temporary scheduling was necessary to address an imminent hazard to public safety.
The temporary scheduling order became effective on August 27, 2026, placing cychlorphine into Schedule I through August 27, 2028, unless the order is extended or the substance is permanently scheduled.
Getting Help For Cychlorphine Dependence
Cychlorphine is another reminder of how unpredictable today's illicit drug supply is.Someone may believe they are using one drug without knowing that a completely different substance, nonetheless a synthetic opioid, is present.
For people who have developed a Cychlorphine dependence, attempting to determine how to detox without medical guidance is very risky, and potentially deadly.
At The Coleman Institute for Addiction Medicine, our medical team evaluates each patient's substance use, medical history, withdrawal risk, and more, before determining whether outpatient detox is appropriate.
With over 25 years of experience in medical detox and a 95% completion rate, we’ve helped thousands of people reclaim their sobriety. The Coleman Institute is also abstinence-based, providing non-addictive naltrexone therapy instead of Suboxone or methadone.
Because cychlorphine is such an uncertain substance, treatment must be individualized rather than based solely on what a pill, powder, or product was believed to contain.
If you or someone you care about is struggling with addiction, contact 888-705-9615 to discuss available treatment options and determine the next step.
