Potent Synthetic Opioid 'Cychlorphine' Circulating in Chicago Area

Officials warn of rise in fatal overdoses linked to drug that may be more potent than fentanyl

Apr. 19, 2026 at 9:10pm

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An extreme close-up X-ray photograph showing the translucent bones and veins of a human hand against a dark background, conceptually representing the hidden dangers of a dangerous synthetic opioid.A ghostly X-ray image reveals the hidden dangers of a potent synthetic opioid circulating in the Chicago area.Chicago Today

Officials in northwest Indiana are warning the public of a rise in fatal overdoses which may be linked to a potent synthetic opioid called 'Cychlorphine.' The substance has been detected in multiple regions around the U.S., including the Chicago area, and may be 'significantly more potent than fentanyl,' according to the Lake County Coroner's Office. The drug could also be resistant to Narcan, the opioid overdose reversal treatment, requiring multiple doses.

Why it matters

The emergence of this highly potent synthetic opioid poses a serious public health threat, as it can dramatically increase the risk of fatal overdoses, especially if it is resistant to standard overdose treatments. This development underscores the ongoing opioid crisis and the need for enhanced prevention, education, and harm reduction efforts in the Chicago region.

The details

According to the alert from the Lake County Coroner's Office, the substance known as 'Cychlorphine' may not be detected on test strips designed to detect the presence of fentanyl. It could also be mixed with other drugs like heroin or methamphetamine, or found in counterfeit pills, making it even more dangerous for unsuspecting users. Researchers have already linked at least 16 deaths to the drug in Tennessee's Knox County.

  • The Lake County Coroner's Office has detected the presence of 'Cychlorphine' in the Chicago area.

The players

Lake County Coroner's Office

The local government agency responsible for investigating deaths in Lake County, Indiana, which has issued a public alert about the presence of the potent synthetic opioid 'Cychlorphine' in the region.

Addiction Center

A national organization that provides information and resources related to substance abuse and addiction, which has reported on the emergence of 'Cychlorphine' and its links to overdose deaths in Tennessee.

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What they’re saying

“The substance may be 'significantly more potent than fentanyl,' according to the office, and could be behind a recent rise in fatal overdoses.”

— Lake County Coroner's Office

What’s next

Public health officials and law enforcement agencies in the Chicago area are working to raise awareness about the presence of 'Cychlorphine' and educate the community on the risks it poses. Harm reduction efforts, including the distribution of Narcan, are also being expanded to help prevent overdose deaths.

The takeaway

The emergence of this highly potent synthetic opioid in the Chicago region underscores the ongoing challenges of the opioid crisis and the need for a multifaceted approach to address the issue, including enhanced prevention, education, harm reduction, and treatment efforts to save lives.