Overview
- The DEA issued a public safety alert warning that fentanyl is being mixed with xylazine, medetomidine, nitazenes, and cychlorphine, which can weaken or defeat naloxone.
- Xylazine and medetomidine are animal tranquilizers, not opioids, so Narcan may not work and first responders may need CPR to keep a person breathing, according to DEA officials in Chicago.
- Nitazenes and cychlorphine are unregulated opioids that labs estimate can be many times stronger than fentanyl, and forensic alerts have linked cychlorphine to recent fatal overdoses across several states.
- Researchers report that detections shifted after China moved to control nitazenes in July 2025, with nitazene findings declining and cychlorphine surfacing more often in cases.
- Officials report fewer fentanyl pills now test at lethal strength and provisional overdose deaths have fallen, yet they urge people to avoid non‑prescribed pills, carry naloxone, and call 911 at the first signs of poisoning.