New Synthetic Opioid Cychlorphine Found in Toronto, Raising Fentanyl-Level Concerns
The opioid crisis continues to hold the world in a dangerous grip. What often begins as a harmless injury requiring painkillers to promote healing can lead to a crippling addiction, fueled by the abundance of drugs supplied by an unregulated market.
Fentanyl, one of the most powerful synthetic opioids, is regularly used for unsupervised recreational purposes – intentionally or unintentionally – and accounts for approximately 70% of all overdose deaths between 2021 and 2024 in the United States, according to the Centers for Disease Control (CDC).
Today, a new, potentially dangerous drug has hit the market: cychlorphine. Also a synthetic opioid, this synthetic substance was detected in three opioid samples collected in Toronto in October 2025. What worries the authorities about this discovery is that its effects on the human body are still unknown. Early pharmacological analyzes suggest it has similar potency to fentanyl, making it a dangerous addition to an already dangerous illegal drug market.
Learn more: Female hormones help the body produce its own opioids to manage pain
New opioid discovered during community drug testing
Many communities offer drug monitoring services, tools that allow people to find out what’s really in their drugs without fear of legal consequences, while also helping authorities monitor what’s circulating in the local market.
One such service in Toronto detected cychlorphine in three opioid samples through on-site analysis using gold standard technologies.
According to their report, the samples must have been hydromorphone (brand name Dilaudide), oxycodone (brand name OxyContin), and Percocet, a combination of oxycodone and acetaminophen. However, they were made entirely of cyclophine and not the drugs they were purported to be.
What we know about cyclophine
According to the Drug Checking Service in Toronto, cychlorphine is a synthetic opioid of unknown strength and effects. Synthetic opioids are entirely man-made and can be significantly more potent than natural opioids like morphine, unfortunately leading to a higher risk of addiction and overdose.
This is why synthetic opioids follow strict prescribing guidelines to reduce unwanted side effects and prevent illegal distribution for drug addiction.
To circumvent bans and other legal controls on specific synthetic opioids, illicit manufacturers often modify chemical structures to create new substances that enter the market disguised as commonly known prescription pills. According to the United Nations Office on Drugs and Crime (UNODC) and the Center for Forensic Sciences Research and Education (CFSRE), since 2024, several new synthetic opioids, including cyclophine, have been reported for the first time in Europe and the United States, keeping public health authorities and law enforcement on alert.
The strength and effects of cychlorphine are unknown
No one yet knows the exact potency or side effects of cychlorphine, making it extremely difficult to assess its true risk. Like fentanyl, which is often unknowingly added to other illicit substances to increase their addictive potential, users may not even realize they are consuming this new synthetic opioid.
In the event of an overdose, experts say the opioid antagonist naloxone should reverse the effects of cychlorphine, like other synthetic opioids.
Although detection is still rare, authorities continue to monitor the unregulated supply of drugs and keep communities informed of the existence of cyclophine and the evolving trend.
This article does not offer medical advice and should be used for informational purposes only.
Learn more: This is what makes some opioids more deadly than others
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