Cychlorphine is an unregulated synthetic opioid that is 10 times stronger than fentanyl and 100 times more potent than heroin and is highly addictive. In the unfolding opioid crisis, cychlorphine use has become more common, found in heroin samples, and linked to a number of overdoses. Many states have issued official warnings about the drug [1] [2].
As illicit drug use grows and the availability and strength of drugs increase, it’s important to know the effects and duration of different substances. This information helps keep people safe, encouraging them to seek care and treat addiction effectively.
Here’s what you need to know about cychlorphine, including how long it lasts.
What is Cychlorphine?
Cychlorphine is the name for N-propionitrile chlorphine. It’s a morphinan derivative that was initially manufactured in laboratories as an experimental opioid but is now sold as a designer drug. It has no medical use and was initially developed to help understand opioid receptor activity and structure-activity relationships among morphinan derivatives.
Cychlorphine is a μ-opioid receptor agonist and its effects are so strong because it binds and activates opioid receptors in the central nervous system.
It typically comes as a white-brown powder, as a tablet, or as blotter paper; however, cychlorphine is commonly mixed with other illegal substances. So far, cychlorphine has been detected in samples from fentanyl, heroin, and cocaine. It has also been found in fake prescription drugs such as Percocet, Xanax, and OxyContin.
What Are the Effects of Cychlorphine?
The effects of cychlorphine are comparable to the effects of other opioids. They include:
- Pain relief
- Sedation
- Slower digestion
- Slowed breathing
- Reduced heart rate
- Reduced alertness
- Loss of consciousness
Respiratory depression (slow or shallow breathing) poses the greatest risk in overdose cases. Combining cychlorphine with alcohol and other sedatives increases the risk significantly.
Because of the high potency of cychlorphine, the possibility of becoming addicted to it is also high.
How Long Do Effects Last?
Research is still being carried out to determine how long cychlorphine effects last. Initial estimates suggest up to 48 hours [3]. The unregulated, synthetic nature of the drug means it’s difficult to conduct fair and consistent evaluations.
What is known, though, is that because cychlorphine is so potent, its effects last longer than fentanyl or heroin. Even microscopic doses can be sufficient to produce effects that last for days. Withdrawal symptoms are likely after stopping use of cychlorphine.
What Are the Risks Associated with Cychlorphine?
Cychlorphine brings many risks. It is a dangerous and increasingly available drug with life-threatening capabilities. Cychlorphine is 10 times more potent than fentanyl and 100 times more potent than heroin [4] [5].
In January 2026, The Center for Forensic Science Research & Education (CFSRE) issued a public alert about the spread of cychlorphine [6]. So far, 78 post-mortem cases from the US and UK have involved cychlorphine [7].
Naloxone (brand name Narcan) is an opioid antagonist and medication used in opioid overdoses. Normally, two doses of Narcan are sufficient to reverse respiratory depression, but the potency of cychlorphine can mean multiple doses are required [8]. The time and skills needed to apply extra doses could be life-threatening in an overdose scenario.
The availability of cychlorphine is a risk, too. It’s been found in 182 drug seizures across 10 countries, including Australia, China, the US, and the UK [9]. The more that it’s available, the more opportunities there are for illegal use, as often people don’t even know it’s cychlorphine they’re taking.
Treatment for Opioid Addiction
Addiction can develop without you immediately noticing. Taking substances to cope with stress, or recreationally at parties, can quickly turn into an ongoing habit. New drugs — especially ones such as cychlorphine that are synthetic and unregulated — pose a new kind of threat. Just one occasion can result in an overdose.
Seeking treatment for an addiction, no matter how early on, isn’t just life-changing; it’s life-saving.
Treatment offers you evidence-based therapies that look at the root cause of addiction and triggers and help reframe thoughts that enable addiction. It also includes wellness activities to nurture your physical and mental health and build healthy daily routines. Where needed, treatment can provide Medication-Assisted Treatment (MAT) to alleviate severe withdrawal symptoms.
Addiction doesn’t have to be forever. Change is possible, and staying safe from substances such as cychlorphine is an investment in your future.
Stay Safe: Start Healing from Addiction at Red Rock Recovery
We offer treatment programs to help you taper off substances, address the causes of addiction, and find long-term stability.
We have a team of licensed clinicians who tailor care to you based on your needs and goals. Our center in Denver, Colorado, is a calm space where we provide evidence-based therapies, Medication-Assisted Treatment (MAT), and holistic activities. Our care is comprehensive to ensure that you gain the skills to not only overcome addiction but also live a more meaningful life.
You deserve to feel better. Speak with our admissions team.
Sources
[1] SpectrumNews1. (March 2026). Gallia County Health Department issues overdose alert over synthetic opioid. spectrumnews1.com.
[2] WKYT. (February 2026). Kentucky Homeland Security warns of synthetic drug more potent than fentanyl detected in central Kentucky. wkyt.com.
[3] CBC. (June 2026). New laboratory-made opioid showing up in B.C.’s unregulated drug supply. cbc.ca.
[4] The Hill. (March 2026). What to know about cychlorphine, the synthetic opioid 10 times stronger than fentanyl. thehill.com.
[5] CBS17. (March 2026). What to know about cychlorphine, the synthetic opioid 10 times stronger than fentanyl. cbs17.com.
[6] CFSRE. (January 2026). INCREASE IN FATAL OVERDOSES LINKED TO NOVEL SYNTHETIC OPIOID N-PROPIONITRILE CHLORPHINE (CYCHLORPHINE). cfsre.org.
[7] UNODC. (May 2026). Tox Dashboard. unodc.org.
[8] Tennessee Department of Health. (March 2026). TDH Reinforces Importance of Naloxone with Rise in Cychlorphine Fatalities. tn.gov.
[9] UNODC. (May 2026). May 2026 – The emerging threat of cychlorphine: A new synthetic opioid raising concerns globally for public health. unodc.org.