If you’ve been through opioid withdrawal, you may have already experienced the aches and sleepless nights that can come with it. But doctors are now seeing a harsher withdrawal pattern in some people who use fentanyl. Along with familiar symptoms, they can develop severe spikes in blood pressure and heart rate.
As of April 2026, the Centers for Disease Control and Prevention (CDC) links this harsher withdrawal to medetomidine, a veterinary sedative that’s been showing up in the street fentanyl supply. Knowing more about it may help you plan a safer way to stop.
Below, we explain how medetomidine withdrawal differs and how supervised detox in Iowa can help.
What Is Medetomidine?
Medetomidine isn’t an opioid, but it is a powerful sedative—one that veterinarians commonly use on dogs. Health officials haven’t approved it for human use. Doctors use its close relative, dexmedetomidine, to sedate patients in hospitals.
According to that CDC health alert, crime lab reports of medetomidine rose from about 250 in 2023 to more than 8,000 in 2025. Nearly a third of 2025 reports came from the Midwest. It also tends to travel with fentanyl, since the CDC reports fentanyl in about 98% of samples containing medetomidine. And because street fentanyl has no ingredient list, you could take medetomidine without knowing it. It’s the newest example of how the overdose crisis keeps changing.
How Is Medetomidine Different From Tranq?
If you read our earlier article on tranq, you already know about xylazine, another animal sedative that can find its way into street fentanyl. Medetomidine is a close cousin, and some people call it “rhino tranq.” However, the CDC describes it as stronger and longer-lasting, possibly without xylazine’s slow-healing wounds. Without those wounds, one of the most noticeable signs of an animal sedative in the supply may no longer be as visible.
Why Is Medetomidine Withdrawal Harder Than Opioid Withdrawal Alone?
Medetomidine adds a second withdrawal on top of opioid withdrawal, and that second layer can compound already severe symptoms and strain the heart even further. In a 2025 CDC report from Philadelphia, three different hospital systems recorded that the majority of patients who needed to be hospitalized for opioid withdrawal also required critical care for medetomidine withdrawal syndrome.
But again, since medetomidine isn’t an opioid, medicines like naloxone don’t seem to fully treat it. Most of the patients needed to be put on IV dexmedetomidine to improve.
How Soon Do Symptoms Start, and When Do They Peak?
Symptoms (a pounding heart, shaking, chest pain, and nonstop vomiting) can start within hours of the last dose and often peak 18 to 36 hours later, according to the CDC. Because those signs can escalate within a day, where you go through withdrawal can affect how safely you get through it.
Why Is Supervised Detox the Safer Path Right Now?
Supervised detox places trained medical staff at your side every hour, especially when symptoms peak. And if symptoms become too severe for typical detox treatment, our staff arranges emergency care.
Why Can’t You Just Manage Withdrawal at Home?
At home, you may have no one trained to recognize when withdrawal symptoms have become dangerous. Vomiting creates a second problem. The patients from the Philadelphia study we mentioned often couldn’t keep down clonidine, a pill that lowers blood pressure during withdrawal. And that’s the type of thing that medical professionals need to address in a proper medical environment.
How Can You Prepare for Detox If You Use Fentanyl?
You can start by being open with intake staff about what you’ve taken and anything you suspect someone mixed in, even if you’re unsure. That way, our clinicians can adequately plan your first days. And since testing keeps detecting medetomidine in more samples, they may prepare for both withdrawals from the start.
Additionally, if you’re calling us with questions, you can also have your insurance card and prescription list to shorten the admissions call, leaving more time for your own questions about detox.
How Does St. Gregory Recovery Center Help You Through Withdrawal in Iowa?
We start with our detox services, where medical staff watch over you continuously, and counseling eases the emotional strain. From there, residential care in Bayard, Iowa, adds 24/7 supervision and more daily therapy. And if you need to keep up with work or family, our Des Moines outpatient program offers both daytime and evening groups.
Cognitive behavioral therapy also helps you catch the thought patterns that could pull you toward fentanyl. Meanwhile, our family program gives the people who love you support of their own.
A Safer Path Through Withdrawal Starts With St. Gregory in Iowa
The street supply may keep changing, but detox with round-the-clock supervision can give you a safer way through medetomidine withdrawal. You don’t need every answer figured out before talking to us. When you’re ready, reach out to St. Gregory, and we’ll help you plan your first step into recovery.
