10/23/2026
A Message from Barnstable County Department of Human Services:
⚠️ A new substance is showing up in the local drug supply
Medetomidine — a sedative used to calm animals — is increasingly being found mixed with illegal opioids, including fentanyl, and people may be exposed without knowing it. It is not approved for use in people, and its effects can be serious. It may also be called Rhino Tranq, Dex, Mede, or Tranq.
Watch for:
• Extreme sleepiness or heavy sedation
• Slowed heart rate and low blood pressure
• Difficulty waking someone up
• Effects that last longer than expected
If someone is unresponsive or breathing slowly, call 911 immediately. Give naloxone (Narcan) if available — it can reverse the opioids that may also be present, but it does not reverse medetomidine itself, so emergency care is still essential. Stay with the person and place them on their side if they are unconscious and breathing.
Withdrawal can also be dangerous. Racing heartbeat, high blood pressure, anxiety, restlessness, sweating, shaking, and nausea or vomiting can begin within a day or two of stopping. Please seek medical care rather than trying to manage withdrawal alone, and tell healthcare providers about possible medetomidine exposure.
Reduce your risk:
• Carry Narcan
• Avoid using alone — Never Use Alone hotline: 1-800-484-3731
• Consider drug checking — the AIDS Support Group of Cape Cod offers medetomidine test strips at all its locations and an anonymous drug-checking machine in Hyannis: 508-778-1854
Help is available 24/7:
Massachusetts Substance Use Helpline — call or text 800-327-5050, helplinema.org
SAMHSA National Helpline — 1-800-662-4357
Learn more about the risks, withdrawal signs, and local support: https://loom.ly/Y_Wd_00