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Abstract: 

This article warns that the growing contamination of illicit opioids with animal tranquilizers such as xylazine and medetomidine could undermine naloxone’s lifesaving power. Pharmacist and researcher C. Michael White reports that roughly one-third of illegal opioids in the U.S. now contain these sedatives, which act on brain alpha-2 receptors unaffected by naloxone. As a result, even timely naloxone administration may fail to restore breathing, with many users requiring ventilation or dying despite treatment. While naloxone remains vital against opioid effects, tranquilizer adulteration creates new medical uncertainty. The study calls for urgent updates to overdose-response protocols, emphasizing earlier 911 calls, immediate rescue breathing, and expanded public awareness of the evolving drug supply.

Keywords: Opioid Overdose; Xylazine; Medetomidine; Naloxone Resistance; Public Health Response

Affiliations:  1: University of Connecticut School of Pharmacy.