Fentanyl super-drug 10 times stronger linked to deaths across states

A synthetic opioid described as more powerful than fentanyl has been tied to dozens of fatalities across the United States, drawing urgent warnings from public health authorities. Cychlorphine, an unregulated compound that acts on the same brain receptors as fentanyl, has surfaced as a lethal addition to the illicit drug supply, with Tennessee emerging as an early epicenter of overdoses.

Tennessee Emerges as Early Hotspot

The state's health department reported in March that more than 30 fatal overdoses had been connected to cychlorphine since October 2025. A subsequent notice issued in April 2026 by the White House's Office of National Drug Control Policy documented at least 41 deaths in Tennessee between July 2025 and February 2026, along with a minimum of 55 fatalities nationwide. Public health and law enforcement records also show fatal overdoses in Illinois, California and Oklahoma. The Los Angeles County Department of Public Health cautioned in its advisory: "Cychlorphine is particularly dangerous due to its strength, where a very small amount can cause someone to stop breathing."

Potency Compared to Fentanyl

Nicholas Kardaras, Ph.D., CEO and chief clinical officer of the New York Center for Living in Manhattan and a clinical professor at Stony Brook Medicine's School of Social Welfare, described the drug as "the new fentanyl on steroids." He also called it "one of the most potent synthetic opioids" currently found in the illicit drug market. "Fentanyl is about 50 times more potent than morphine or heroin," he told Fox News Digital. "Cychlorphine is reportedly up to 10 times more potent than fentanyl — so theoretically, about 500 times more potent than morphine or heroin." According to the Drug Enforcement Administration, cychlorphine is a novel, unregulated synthetic opioid that activates the same receptors as fentanyl. It can produce deep sedation, respiratory depression or arrest, and death. The compound has no approved medical use and has appeared in illicit drugs and counterfeit pills.

Unwitting Exposure and Growing Access

Kardaras noted that cychlorphine can be consumed in multiple ways — swallowed as a pill, snorted as a powder, or crushed and injected intravenously. Beyond its potency, he warned that it is frequently blended into other designer drugs and fake pills. "The problem has been, in addition to its potency, it's often put in other designer drugs and in counterfeit pills," he cautioned. "It's a constant battle of keeping up with the latest iterations of new drugs." Some users actively pursue the drug for its strength, while others take it without knowing. "Sometimes, by talking about how potent some of these substances are, we increase the allure of them for some addicts, unfortunately," Kardaras said. Although primarily a street drug, cychlorphine can also be obtained online or through what he termed "boutique designer-drug markets." Anyone can suffer a fatal overdose from the drug, regardless of age, according to Kardaras. However, younger individuals may encounter it more often because they are likelier to experiment with drugs or buy counterfeit pills. "They're buying something online … and all of a sudden, without knowing it, they're ingesting fentanyl or another synthetic opioid," he said.