Potent Synthetic Opioid Cychlorphine Emerged in Drug Supply

The drug is estimated to be 10 times more potent than fentanyl and can be found in counterfeit pills.

Updated on Oct. 12, 2026 in Substance Abuse

Potent Synthetic Opioid Cychlorphine Emerged in Drug Supply

Live Poll

Do you feel adequately informed about the presence of dangerous new opioids in your community?

The Drug Enforcement Administration has identified cychlorphine, a potent synthetic opioid, circulating within the U.S. illicit drug supply. This substance, which has been found in counterfeit versions of medications like Percocet and OxyContin, poses an increased risk for overdose because it is significantly stronger than fentanyl.

Why it matters

Cychlorphine can dangerously suppress breathing and lead to loss of consciousness, making it a critical public health concern. Because it does not show up on standard fentanyl test strips, individuals are often unaware they are consuming this much more potent opioid.

Official reports indicate cychlorphine is an estimated 10 times more potent than fentanyl. While surveillance confirms its presence across the country, it remains unclear how many counterfeit pills in the current illicit market contain this specific synthetic opioid.

The players

Drug Enforcement Administration

The federal agency responsible for enforcing controlled substances laws and monitoring the illicit drug supply.

San Francisco Police

The local law enforcement agency conducting investigations into drug-related fatal overdoses and illicit pill distribution.

Campus Health & Wellbeing

A health service organization that recently integrated information about cychlorphine into its Narcan training programs.

The details

Cychlorphine appears in counterfeit pills or powder without the user's knowledge, often mimicking prescription drugs like Dilaudid. It functions as a powerful opioid receptor agonist that can rapidly suppress breathing. Reversing an overdose involving this substance may require multiple doses of naloxone, as its high potency can override standard emergency interventions.

April 2024: The Drug Enforcement Administration reported its first detection of cychlorphine in Florida.
April 2026: A 16-year-old San Francisco resident died following a fatal overdose.
September 2026: San Francisco police arrested four people and seized 20,000 counterfeit pills.

Health Landscape

The emergence of cychlorphine follows the established pattern of illicit drug supply contamination previously seen with fentanyl. This development marks a shift toward even more potent synthetic opioids, complicating existing harm reduction strategies that were designed for less concentrated substances.

Because standard fentanyl test strips do not detect cychlorphine, you should be aware that no currently available home test can confirm its presence. If you or a loved one are concerned about exposure, it is worth discussing the risks of synthetic opioids and the necessity of carrying multiple doses of naloxone with a physician.

The takeaway

Cychlorphine is a significantly more potent synthetic opioid than fentanyl and can be hidden in pills that look like legitimate prescriptions. Recognize that an overdose from this substance may require more than the standard number of naloxone doses during an emergency response.