Medetomidine Addiction: Signs and Side Effects of Medetomidine Abuse

Veterinarians use medetomidine as a sedative and an anesthetic. Although it’s only approved for veterinary use, this substance is often mixed with fentanyl, opioids and illicit drugs, causing longer-lasting effects and severe withdrawal symptoms.

Although medetomidine contains dexmedetomidine, it’s only approved for use in animals. In contrast, hospitals use dexmedetomidine in humans in operating rooms, emergency departments and intensive care units as a sedative or pain reliever. On the streets, medetomidine is known as “rhino tranq.”

Medetomidine is classified as an αlpah2-adrenergic (a2-adrenergic) receptor agonist, so it causes profound sedation, slows down the heart and lowers blood pressure significantly. It first made its way into street drugs in 2022, but spiked in 2024, with an increase of 29% to 87% in samples tested between May and November 2024. The lack of research on the use of medetomidine in humans makes it extremely dangerous.

Due to the potential for harm, it’s essential to know the side effects of medetomidine, signs and symptoms of dependence and potential risks of abuse. On this page, you’ll learn about medetomidine itself, not general veterinary sedatives or the mixing of medetomidine with other substances.

Like other α2-adrenergic receptor agonists, medetomidine works on alpha-2 receptors, which slow down the central nervous system. Suppressing the nervous system also reduces the amount of norepinephrine released.

Norepinephrine is a neurotransmitter involved in the fight-or-flight response. When you’re exposed to a stressful situation, your heart rate and blood pressure increase. You also become more alert.

Limiting norepinephrine release has the opposite effect. Instead of speeding up, your heart rate and blood pressure decrease, meaning medetomidine has a calming effect.

Medetomidine brain effects may even cause you to experience dissociation, which causes you to feel disconnected from your thoughts, feelings, behaviors and environment. For some people, dissociation reduces stress and anxiety. Once the brain starts to associate medetomidine with physical and emotional relief, you’re more likely to continue using it.

Although some people take medetomidine on its own, the drug is often mixed with opioids, especially fentanyl, a synthetic opioid. Some people purposely add medetomidine to fentanyl and other substances to enhance the sedative effect. Others take medetomidine unintentionally, not knowing that it’s mixed with the other drugs they’re using.

According to the Centers for Disease Control and Prevention (CDC), medetomidine is stronger than xylazine, another sedative used in animals. One study in the Journal of Ocular Pharmacology suggests it’s 200 times more potent than xylazine. Even if you’ve been exposed to xylazine before, your body may respond differently to medetomidine due to its potency.

Medetomidine abuse, or misuse, refers to the non-medical use of this substance. The label applies to intentional misuse as well as accidental ingestion while using other drugs. Because there aren’t any approved medicinal uses for humans, any medetomidine use would be considered misuse.

Addiction is characterized by compulsive use. People addicted to medetomidine crave its calming, sedating effects. Addiction may also cause you to continue using medetomidine even when it negatively impacts your life.

For example, someone who’s addicted to medetomidine might keep using it despite experiencing serious adverse effects. Because it’s commonly added to illicit drugs, repeated exposure can cause someone to transition from misuse to addiction even if they had no intention of using the substance.

Due to its effect on the central nervous system, medetomidine can cause physical or psychological dependence. Some users may also develop substance use disorders (SUDs).

Physical medetomidine dependence is when someone experiences unpleasant physical symptoms if they start taking smaller doses or stop using medetomidine abruptly. Physical dependence can cause the user to go through withdrawal symptoms.

Psychological dependence causes intense psychological cravings for medetomidine. Users may also experience these unpleasant emotional effects when they stop using the drug or take smaller doses:

• Loss of interest in usual activities
• Emotional numbness
• Feelings of emptiness
• Anxiety
• Agitation
• Restlessness
• Distress

While dependence and tolerance are often used interchangeably, a person can become tolerant to a drug while not being dependent on it. If you become tolerant, you need larger doses of medetomidine to receive the same effect. Conversely, if you become dependent, your body adapts to the drug and can’t function normally without it.

Substance use disorder is a harmful pattern of substance use that affects every aspect of your life. Developing an SUD makes it challenging to reduce medetomidine use. Over time, you may have trouble maintaining employment, going to school or managing your responsibilities at home. It’s also common for medetomidine to harm personal relationships.

If you have an SUD involving medetomidine, you may also engage in these behaviors:

• Spending a lot of time trying to access medetomidine.
• Giving up social and recreational activities to have more time to use medetomidine.
• Continuing to use medetomidine even when it puts your health in danger.

The risk of dependence increases if you use medetomidine regularly or combine it with other CNS depressants. Once you’re dependent on it, you may continue using medetomidine even if it makes your physical or mental health conditions worse.

Medetomidine has behavioral, physical, psychological and functional effects. No two people experience the same combination of symptoms, but there are common symptoms to be aware of.

Cravings are one of the most common signs of medetomidine addiction. In some cases, cravings get stronger in certain environments or when you’re around specific people. For example, if you have a poor relationship with one of your family members, you may experience stronger cravings when you spend time with that person.

Additional behavioral signs of medetomidine addiction include:

• Repeated drug seeking
• Secrecy around substance use
• Continued use despite overdose risk

Medetomidine addiction also causes behavioral changes at work, home and school. If you’re employed, you may leave work early, come in late or call in sick more often than usual. You might also find yourself missing deadlines or losing interest in your work.

For some people, medetomidine addiction makes it difficult to keep up with household responsibilities. You might stop doing dishes, laundry and other chores.

If you live with other people, you may not be able to follow through on your commitments. For instance, a parent might have to ask someone else to drive their children to school.

If you’re a student, medetomidine may make it difficult to pay attention in class or complete assignments on time. Some people miss classes or get poor grades.

Medetomidine addiction may even cause you to give up your favorite activities. Some people stop doing the things they used to love, so they have more time to use medetomidine. Others avoid participating because they’re embarrassed or don’t want anyone to notice the physical signs of their medetomidine use.

The physical signs of medetomidine addiction come from its effects on alpha-2 receptors in the central nervous system. Due to heavy sedation, you may experience extreme drowsiness. It’s also common to faint or feel dizzy.

By limiting norepinephrine release, medetomidine reduces blood pressure and lowers your heart rate. Some people even experience nausea or shortness of breath.

Some medetomidine abuse symptoms affect a person’s mental status and emotions. If you develop an addiction, you may feel confused or disoriented every time you use medetomidine. Researchers from the University of North Carolina at Chapel Hill and the University of British Columbia report that medetomidine may even have hallucinogenic effects.

Hallucinogens affect your thoughts, feelings and perceptions. For example, a hallucinogen like medetomidine can change your perception of reality.

When you’re addicted to a substance, it affects your ability to regulate your emotions. In addition to intense cravings, you may feel deep anxiety when you can’t use medetomidine.

Due to its sedating effects, medetomidine makes it challenging to stay awake. As a result, some users have difficulty meeting their obligations.

When you’re under the effects of medetomidine, you may also have trouble responding to your surroundings. The physical and psychological impact of medetomidine use may make these functional symptoms even worse.

According to the Philadelphia Department of Public Health, stopping medetomidine may cause some users to go through a severe withdrawal syndrome. However, the effects of medetomidine withdrawal are challenging to predict, as researchers have limited data on human use.

The most common signs of medetomidine withdrawal include:

• Fast heart rate (tachycardia)
• Severe hypertension (high blood pressure)
• Nausea and vomiting
• Sweating
• Anxiety
• Restlessness
• Tremors (jerking movements)
• Sleep disturbances

Many of these symptoms occur due to rebound sympathetic activity. Medetomidine slows down the central nervous system, but stopping it causes a sudden surge in the fight-or-flight response. Rebound sympathetic activity occurs due to reactivation of the sympathetic nervous system.

Some people experience such severe withdrawal symptoms that they require a higher level of medical care. These symptoms include:

• Severely high blood pressure
• Chest pain
• Nausea and vomiting that won’t stop
• Concerning EKG changes
• Severe symptoms that don’t resolve within 4 to 6 hours of initial treatment

Medetomidine abuse has short-term and long-term effects. Shortly after taking medetomidine, you may experience slower breathing, low heart rate and extremely low blood pressure (hypotension). Profound sedation is another common effect.

Even though they only last up to a few hours, these medetomidine side effects have some serious risks. For example, medetomidine abuse can cause serious heart problems.

Long QT syndrome is one of the heart complications associated with medetomidine. If you have long QT syndrome, it takes longer than it should for your heart to recover between beats. This side effect can cause heart palpitations, weakness, lightheadedness and fainting.

Medetomidine has also been linked to loss of consciousness and overdose deaths. The risk of drug overdose is especially high when you mix medetomidine with fentanyl or other drugs. Researchers from Banner Gateway Medical Center report a “troubling trend of increasing fatalities” due to the addition of medetomidine to the illicit drug supply.

Risk factors are the behaviors, characteristics, and exposures that increase the likelihood of developing a disease or mental health condition. One of the biggest risk factors for medetomidine addiction is exposure to adulterated drugs. Even if you don’t intend to take medetomidine, you may be exposed to it while using heroin or another street drug.

A history of opioid use disorder or sedative misuse may also increase the risk of developing medetomidine addiction. Scientists from the National Institutes of Health have identified multiple genes associated with substance use disorders. If you have a variant of one or more of these genes, you may start using medetomidine even if you’ve recovered from an addiction to a different substance.

Many people aren’t aware that medetomidine may be present in non-veterinary settings, increasing the risk that you’ll come into contact with it. You have a higher risk of medetomidine addiction if you don’t know the composition of the illicit drugs you use.

Overdose is always a risk in addiction. Medetomidine was associated with an increase in overdoses in Philadelphia, Pittsburgh and Chicago in April and May 2024. Furthermore, an increase in the severity and variation of withdrawal symptoms was also noted through early 2025, per the Philadelphia Department of Public Health.

It’s not possible to diagnose a medetomidine addiction with a blood test. Even if you test positive for medetomidine, simply having it in your body doesn’t mean you’re addicted to it. Medetomidine isn’t included in routine toxicology screening tests, but it can be detected in the body through saliva or other samples.

When diagnosing medetomidine addiction, medical professionals rely on substance use disorder criteria and clinical presentation. If you seek help for medetomidine abuse, someone on your healthcare team may ask questions about your symptoms, exposure history and patterns of repeated intoxication.

Extreme sedation, frequent overdoses and unexplained symptoms can all contribute to long-term health problems. Medetomidine exposure increases the risk of overdose, especially when it’s mixed with opioids.

RehabNet is a free, confidential source that can help you find a treatment center familiar with emerging sedative and adulterant-related addictions. If medetomidine addiction is affecting your health, safety or ability to function, seek professional help.me