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               Congressional                                                       ____
           ~   Research Service






Xylazine: Considerations for Federal Control



Updated August 1, 2023

Xylazine is a sedative drug used in veterinary medicine. It is not approved or intended for human
consumption. Some drug users intentionally consume xylazine in combination with drugs of abuse, such
as illicit fentanyl, to strengthen its effects, while other users are unaware that xylazine is sometimes added
to illicit opioids as an adulterant. Xylazine is also used in drug-facilitated crimes to induce a state of
unconsciousness. The Centers for Disease Control and Prevention (CDC), Food and Drug Administration
(FDA), Drug Enforcement Administration (DEA), and Office of National Drug Control Policy have
issued warnings regarding the risks of humans consuming xylazine, and media reports indicate the
substance is worsening addiction and causing physical wounds among those who use illicit opioids.
Xylazine is not currently controlled under the Controlled Substances Act (CSA). As Congress weighs the
legitimate use of xylazine and the risk it poses to public safety and health, it might consider making it a
controlled substance under the CSA, thereby allowing DEA to regulate the substance.

The   Legitimate Use and Adverse Effects of Xylazine

Veterinarians use xylazine on cattle, horses, and cervidae (e.g., deer) animals as a sedative and pain
reliever. According to FDA, it is not safe for use in humans and may result in serious and life-threatening
side effects that appear to be similar to those commonly associated with opioid use, making it difficult to
distinguish opioid overdoses from xylazine exposure. Xylazine can increase the risk of fatal overdose
because it can cause respiratory depression, low blood pressure, and slowed heart rate.
Xylazine is not an opioid, and therefore opioid overdose reversal drugs, such as naloxone, do not
counteract its effects. According to the CDC naloxone may be less effective in reversing an opioid-related
overdose if illicit opioid substances contain xylazine because xylazine can heighten the sedation and
respiratory effects of opioids. Several states have reported increases in xylazine-involved overdose deaths,
although the prevalence of xylazine in drug overdose deaths has not been extensively studied. Xylazine
consumption in humans can reportedly cause wounds that erupt with a scaly dead tissue that left
untreated can lead to the need for amputation.
FDA  has restricted the import of unapproved xylazine and has collaborated with U.S. Customs and
Border Protection to limit the illicit spread of xylazine while maintaining availability for its legitimate
use. DEA reports increasing xylazine encounters across the United States, most commonly in the
Northeast. Xylazine is frequently found in polydrug mixtures, often in mixtures containing illicit fentanyl.

                                                                  Congressional Research Service
                                                                    https://crsreports.congress.gov
                                                                                        IN12086

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