Dangerous New Synthetic Opioid Cychlorphine Linked to Rising Overdose Deaths

Health officials in the U.S. are raising alarms over a potent new synthetic opioid called cychlorphine, which is reportedly stronger than fentanyl. This drug has been connected to numerous fatalities across the country.

Rising Threat in Several States

In Tennessee, cychlorphine has caused over 30 fatal overdoses since October 2025, as reported by the state’s health department. National data from the White House’s Office of National Drug Control Policy highlights at least 41 deaths in Tennessee and an additional 55 nationwide since July 2025.

Other states, including Illinois, California, and Oklahoma, have also reported deaths linked to cychlorphine. This substance poses extreme risks due to its high potency, capable of causing severe respiratory depression with minimal amounts, according to the Los Angeles County Department of Public Health.

Expert Warnings

Nicholas Kardaras, Ph.D., a clinical officer in New York, described cychlorphine as significantly more potent than fentanyl, stating it’s akin to “fentanyl on steroids.” This unregulated drug activates opioid receptors and can result in deep sedation, respiratory arrest, and death.

Cychlorphine can be ingested via pills, snorted as powder, or injected. Kardaras warned about its clandestine inclusion in designer drugs and counterfeit pills, making it a concealed danger for those unaware of its presence.

Youth Vulnerability and Awareness

Young individuals are particularly at risk, often experimenting with drugs or purchasing counterfeit pills without realizing the presence of cychlorphine. Unintentional consumption of this powerful opioid poses severe health threats.

Naloxone, known commercially as Narcan, can counteract cychlorphine’s effects. However, higher and repeated doses may be necessary, as stated by Kardaras.

Detection Challenges

Current testing strips for fentanyl and routine urine screens fail to detect cychlorphine. This leaves a significant gap in identifying and responding to its presence in the drug supply.

Kardaras emphasized the triple challenge cychlorphine presents: extreme potency, lack of detection by standard tests, and the need for multiple naloxone doses in overdoses. This underscores the ongoing struggle to control the emerging threats from novel drugs.