Xenazine (Tetrabenazine) - Oral


The Food and Drug Administration (FDA) assigned a black box warning of depression and suicide risks with Xenazine. Let your healthcare provider know right away if you and your loved ones notice any new/worsening symptoms of depression, sadness, loss of interest in activities you used to enjoy, suicidal thoughts/attempts, or other mood/behavioral changes (such as new/worsening anxiety, panic attacks, trouble sleeping, irritability, hostile/angry feelings, severe restlessness, very rapid speech).

What Is Xenazine?

Xenazine (tetrabenazine) is a medication option used to treat abnormal and extra muscle movements in people with Huntington's disease (HD).

Xenazine is a vesicular monoamine transporter 2 (VMAT2) inhibitor. It's thought to work by preventing VMAT2 from moving monoamines (naturally occurring brain chemicals) into vesicles. Neurons (nerve cells) make the monoamines—like dopamine—and store the brain chemicals in vesicles. Blocking VMAT2 eventually leads to decreasing amounts of monoamines.

Xenazine is available as a prescription tablet.

Drug Facts

Generic Name: Tetrabenazine

Brand Name(s): Xenazine

Drug Availability: Prescription

Therapeutic Classification: Vesicular monoamine transporter 2 (VMAT2) inhibitor

Available Generically: Yes

Controlled Substance: No

Administration Route: Oral (by mouth)

Active Ingredient: Tetrabenazine

Dosage Form(s): Tablet

What Is Xenazine Used For?

Xenazine is used to treat abnormal and extra muscle movements in Huntington's disease (HD).

HD is a medical condition that runs in families. In HD, there is a loss of brain and muscle function that worsens over time. People with HD tend to experience chorea (uncontrolled muscle movements). Symptoms may also include changes in mood, behavior, and ways of thinking.

HD is estimated to affect between 300 to 3,000 people in the United States (U.S.). Most people with HD typically begin to have symptoms in their 30s and 40s. There are a smaller number of people who experience an early onset of symptoms as children.

How to Take Xenazine

In general, Xenazine is taken by mouth with or without food. You will usually start taking Xenazine once daily. As your healthcare provider slowly increases your dosage, however, you will likely take Xenazine two to three times daily.


When you receive Xenazine from the pharmacy, store it at 77 degrees Fahrenheit (F)—with a short-term safety storage range of 59 degrees to 86 degrees F.

To be safe, you may also place Xenazine in a locked cabinet or closet to keep your medication out of the reach of children and pets.

If you plan to travel with Xenazine, get familiar with your final destination's regulations. Checking with the U.S. embassy or consulate might be a helpful resource. In general, however, be sure to make a copy of your Xenazine prescription. If possible, keep your medication in its original container from your pharmacy with your name on the label. If you have any questions about traveling with your medicine, be sure to ask your pharmacist or healthcare provider.

You can also ask your pharmacist or healthcare provider about the best ways to dispose of your medications. The FDA's website is a potentially helpful resource to know where and how to discard all unused and expired drugs. You can also find disposal boxes in your area.

How Long Does Xenazine Take to Work?

You may notice an improvement in your symptoms within 90 minutes of taking Xenazine.

Off-Label Uses

Experts may recommend using Xenazine to treat tardive dyskinesia (TD). TD is a condition of abnormal muscle movements in the face, neck, arms, and legs. TD is a serious side effect of antipsychotic medications—like haloperidol.

What are the Side Effects of Xenazine?

This is not a complete list of side effects and others may occur. A healthcare provider can advise you on side effects. If you experience other effects, contact your pharmacist or a healthcare provider. You may report side effects to the FDA at fda.gov/medwatch or 800-FDA-1088.

Common Side Effects

Common side effects with Xenazine may include:

  • Anxiety
  • Nausea
  • Restlessness
  • Sleepiness or drowsiness
  • Sleeping difficulties
  • Tiredness or low energy

Severe Side Effects

Get medical help right away if you develop any of the following serious side effects. Call 911 if your symptoms feel life-threatening.

Serious side effects of Xenazine and their symptoms include:

  • Severe allergic reaction: If you have a severe allergic reaction to Xenazine, you may experience symptoms of itchiness, rash, and swelling.
  • Abnormal heart rhythm: Xenazine may raise your risk of an abnormal heart rhythm. The likelihood of this increases if Xenazine is combined with other medications—like the levofloxacinfluoroquinolone antibiotic—that also have the same risk.
  • Depression and suicide risk: Xenazine raises your risk of depression and suicide. Keep an eye out for changes in mood and behavior.
  • Excess Xenazine in melanin-containing tissues: Melanin is a dark-colored substance that can be found in the following tissues: skin, hair, and eyes. Xenazine may build up in these tissues over time. Excess Xenazine in these tissues may lead to toxicity or injury.
  • High prolactin levels: Xenazine may lead to high prolactin hormone levels. High amounts of prolactin are typically linked to the following symptoms: missing menstrual periods, enlarged breasts, lactation (milky substance leaking from the nipples), and erectile dysfunction (ED).
  • Low blood pressure: Xenazine is linked to dangerously low blood pressure. If you have low blood pressure, you may feel dizzy or faint.
  • Neuroleptic malignant syndrome: Neuroleptic malignant syndrome (NMS) is a rare and life-threatening reaction to certain medications—like Xenazine. Symptoms may include muscle stiffness, blood pressure changes, high fever, excessive sweating, and a lot of salivae (spit). You may also experience changes in mood or behavior.
  • Restlessness: Restless is a common side effect of Xenazine. At high doses of Xenazine, however, this side effect can become excessive and severe. You may also experience agitation and Parkinson-like symptoms.
  • Sleepiness and drowsiness: Although sleepiness and drowsiness are common side effects of Xenazine, they can become excessive and severe.

Long-Term Side Effects

Possible long-term side effects of Xenazine may include:

  • Anxiety
  • Depression
  • Drowsiness
  • Parkinson-like symptoms
  • Restlessness
  • Sleeping difficulties

Long-term use of Xenazine may lead to a build-up of this medication in melanin-containing tissues, such as the eyes. Excess Xenazine in these tissues may lead to toxicity and injury.

Report Side Effects

Xenazine may cause other side effects. Call your healthcare provider if you have any unusual problems while taking this medication.

If you experience a serious side effect, you or your provider may send a report to the FDA's MedWatch Adverse Event Reporting Program or by phone (800-332-1088).

Dosage: How Much Xenazine Should I Take?

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The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

  • For oral dosage form (tablets):
    • For chorea:
      • Adults—At first, 12.5 milligrams (mg) in the morning once a day. Your doctor may adjust your dose if needed. However, the dose is usually not more than 100 mg per day.
      • Children—Use and dose must be determined by your doctor.


The following modifications (changes) should be kept in mind when using Xenazine:

Severe allergic reaction: Avoid using Xenazine if you have a known allergy to it or any of its ingredients. Ask your pharmacist or healthcare provider for a complete list of the ingredients if you're unsure.

Pregnancy: In animal studies in rats, Xenazine was linked to negative effects on the fetus. We don't know enough about the safety and effectiveness of Xenazine in pregnant people and on their unborn fetuses. Discuss with your healthcare provider if you plan to become pregnant or are pregnant. Your healthcare provider can help you weigh the benefits and risks of taking Xenazine during your pregnancy.

Breastfeeding: We don't know enough of about the safety and effects of Xenazine in human breastmilk and nursing babies. Talk with your healthcare provider if you plan to breastfeed. Your healthcare provider can help you weigh the benefits and harms of taking Xenazine while nursing. They can also discuss the different ways available to feed your baby.

Adults over 65: Clinical studies haven't included a large enough number of people in this age group to see whether they respond differently from younger adults.

Children: There is limited safety and effectiveness information about Xenazine in children.

Liver problems: If you have any degree of liver impairment, Xenazine isn't recommended for you.

Poor CYP2D6 metabolizers: CYP2D6 is a protein in the liver. It's responsible for breaking down medications—like Xenazine. Some people are poor CYP2D6 metabolizers (PMs). If you're a PM, this means that your CYP2D6 proteins don't work as quickly as the general public. As a result, you're at risk of more side effects from the build-up of Xenazine in your body. Therefore, your healthcare provider will likely limit your maximum total daily dose (TDD) to 50 milligrams (mg). They may also recommend that you don't take more than 25 milligrams at any time. So your highest Xenazine dosage, for example, might be 25 milligrams twice daily.

Extensive or intermediate CYP2D6 metabolizers: Some people are extensive (EM) or intermediate (IM) CYP2D6 metabolizers. If you're an EM or IM, your CYP2D6 proteins work more quickly than PM. Therefore, your healthcare provider may recommend a maximum TDD of up to 100 milligrams, but you may only take up to 37.5 milligrams at any time. For example, your healthcare provider may recommend the following Xenazine dosage: 25 milligrams in the morning, 37.5 milligrams in the afternoon, and 37.5 milligrams in the evening.

Missed Dose

If you accidentally forgot your Xenazine dose, take it as soon as you remember. If it's already close to your next scheduled dose, however, then skip the missed dose and take the following dose at your next scheduled dosing time. Don't try to double up to make up for the missed dose.

If you miss more than five days of Xenazine doses, talk with your healthcare provider before taking Xenazine again. Your healthcare provider may need to restart you at a lower Xenazine dose.

Try to find ways that work for you to help yourself remember to routinely take your medication. If you miss just one Xenazine dose, your uncontrolled muscle movements may come back or worsen within 15 to 18 hours of your last dose.

Overdose: What Happens If I Take Too Much Xenazine?

There are reports of overdose with Xenazine—with a dosage range of 100 to 1000 milligrams (mg). Symptoms of a suspected overdose may include:

  • Abnormal and uncontrollable muscle movements
  • Confusion
  • Diarrhea
  • Eye muscle spasms that cause the eyeball(s) to be fixed in one position—typically upwards
  • Low blood pressure
  • Nausea and vomiting
  • Skin redness
  • Sleepiness and drowsiness
  • Sweating
  • Tremors

If you think that you're experiencing an overdose or life-threatening symptoms, seek immediate medical attention.

What Happens If I Overdose on Xenazine?

If you think you or someone else may have overdosed on Xenazine, call a healthcare provider or the Poison Control Center (800-222-1222).

If someone collapses or isn't breathing after taking Xenazine, call 911 immediately.


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It is very important that your doctor check your progress at regular visits to see if the medicine is working properly and to allow for changes in the dose.

Tetrabenazine may cause some people to be agitated, irritable, or display other abnormal behaviors. It may also cause some people to have suicidal thoughts and tendencies, or to become more depressed. If you or your caregiver notice any of these side effects, tell your doctor right away.

Do not take this medicine if you are also taking a monoamine oxidase (MAO) inhibitor such as isocarboxazid (Marplan®), phenelzine (Nardil®), selegiline (Eldepryl®), or tranylcypromine (Parnate®). If you have questions, check with your doctor.

Do not take this medicine if you are also taking reserpine (Harmonyl®). Wait at least 20 days after stopping reserpine before starting tetrabenazine. If you have questions, check with your doctor.

Check with your doctor right away if you have more than one of these symptoms while taking this medicine: convulsions (seizures), difficulty with breathing, a fast heartbeat, a high fever, high or low blood pressure, increased sweating, loss of bladder control, severe muscle stiffness, unusually pale skin, or tiredness. These could be symptoms of a serious condition called neuroleptic malignant syndrome (NMS).

This medicine may cause drowsiness, trouble with thinking, or trouble with controlling movements. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are not alert or able to think well.

Make sure your doctor knows if you are using chlorpromazine (Thorazine®), thioridazine (Mellaril®), ziprasidone (Geodon®), moxifloxacin (Avelox®), quinidine, procainamide (Pronestyl®), amiodarone (Cordarone®), or sotalol (Betapase®). Using any of these medicines together with tetrabenazine may cause serious side effects.

This medicine may cause tardive dyskinesia (a movement disorder). This may not go away after you stop using the medicine. Check with your doctor right away if you have any of the following symptoms while taking this medicine: lip smacking or puckering, puffing of the cheeks, rapid or worm-like movements of the tongue, uncontrolled chewing movements, or uncontrolled movements of the arms and legs.

Dizziness, lightheadedness, or fainting may occur, especially when you get up from a lying or sitting position. Getting up slowly may help. If the problem continues or gets worse, check with your doctor.

This medicine will add to the effects of alcohol and other central nervous system (CNS) depressants. CNS depressants are medicines that slow down the nervous system, which may cause drowsiness or make you less alert. Some examples of CNS depressants are antihistamines or medicine for hay fever, allergies, or colds; sedatives, tranquilizers, or sleeping medicine; prescription pain medicine or narcotics; barbiturates (used for seizures); muscle relaxants; or anesthetics (numbing medicines), including some dental anesthetics. This effect may last for a few days after you stop taking this medicine. Check with your doctor before taking any of the above while you are using this medicine. 

What Are Reasons I Shouldn’t Take Xenazine?

Before taking Xenazine, talk with your healthcare provider if any of the following applies to you:

  • Severe allergic reaction: If you have a severe allergic reaction to Xenazine or any of its components (ingredients), then Xenazine isn't a viable option for you.
  • Depression and suicide: Xenazine may raise the risk of depression and suicide. If you're having undertreated depression or actively experiencing a suicidal crisis, then taking Xenazine isn't recommended.
  • Pregnancy: In humans, there is not enough information on the effects and safety of Xenazine on the unborn fetus. Discuss with your healthcare provider about the benefits and risks of taking Xenazine during your pregnancy.
  • Breastfeeding: In humans, there is limited data on the effects and safety of Xenazine on nursing babies. Talk with your healthcare provider about the benefits and harms of taking Xenazine while nursing.
  • Adults over 65: There isn't enough data to assess the differences in effectiveness and safety of Xenazine between older and younger adults.
  • Children: We don't have enough information about the effectiveness and safety of Xenazine in children.
  • Liver problems: Xenazine is broken down by proteins in the liver. If you have any degree of liver impairment, Xenazine isn't recommended for you.
  • Monoamine oxidase inhibitor (MAOI) use: If you've taken an MAOI—like selegiline for depression or Parkinson's disease (PD)—within the last 14 days, don't take Xenazine.
  • Reserpine use: If you've taken reserpine within the previous 20 days, avoid Xenazine. Reserpine is a treatment option for high blood pressure or schizophrenia.
  • Austedo and Ingrezza: Austedo (deutetrabenazine) and Ingrezza (valbenazine) are used for muscle movement conditions. Like Xenazine, they are also VMAT2 inhibitors. Avoid combining Xenazine with another VMAT2 inhibitor.

What Other Medications Interact With Xenazine?

As previously mentioned, avoid combining Xenazine with other VMAT2 inhibitors—like Austedo and Ingrezza. You should also avoid Xenazine with MAOIs within the previous 14 days and reserpine within the last 20 days.

The following are additional medications to use with caution when taking Xenazine:

  • Abnormal heart rhythm medications: Xenazine may raise your risk of an abnormal heart rhythm. An irregular heart rhythm is more likely when Xenazine is combined with other medications—like the levofloxacin fluoroquinolone antibiotic—that have the same side effect.
  • Alcohol and other sleep-inducing medications: Combining Xenazine with alcohol or other sleep-inducing medications may worsen the side effects of drowsiness and sleepiness.
  • Antipsychotic medications: Taking Xenazine with antipsychotic medications—like haloperidol—raises your risk of severe side effects like restlessness, Parkinson-like symptoms (ex., tremors), and neuroleptic malignant syndrome (NMS) (a life-threatening condition with fever and changes in mental status).
  • CYP2D6 inhibitors: CYP2D6 is a protein in the liver responsible for breaking down medications—like Xenazine. If you take a CYP2D6 inhibitor—like Prozac (fluoxetine), your CYP2D6 will not work either. As a result, you may have a build-up of Xenazine in your body—with a higher likelihood of side effects. Therefore, your healthcare provider may need to lower your Xenazine dosage.

Talk with your pharmacist or healthcare provider for more detailed information about medication interactions with Xenazine.

And be sure to talk with your healthcare provider about any other medicines you take or plan to take, including over-the-counter, nonprescription products, vitamins, herbs, or plant-based medicines.

What Medications Are Similar?

A few medication options are used for Huntington's disease (HD) chorea (abnormal and uncontrolled muscle movements). Of all the available options, experts tend to recommend Xenazine as the first-choice option for HD chorea.

Xenazine is a vesicle monoamine transporter 2 (VMAT2) inhibitor that affects the amounts and activities of various brain chemicals—especially dopamine. So, other similar medications include another VMAT2 inhibitor (e.g., Austedo) and second-generation antipsychotics (e.g., clozapine, olanzapine, etc.).

Experts recommend Austedo as a potential alternative to Xenazine. Both medications are VMAT2 inhibitors, but Austedo isn't available as a generic version yet. Therefore, Austedo might be more costly than Xenazine.

Many second-generation antipsychotics, on the other hand, are available as generic products. For HD chorea, experts may recommend second-generation antipsychotics as go-to options—especially if an individual with HD chorea also has a behavioral or mental health condition.

Treating HD chorea is preferred over multiple medications to limit side effects. Furthermore, combining multiple VMAT2 inhibitors should be avoided.

Frequently Asked Questions

  • Where is Xenazine available?

    Xenazine isn't typically available at your local retail pharmacy. Your healthcare provider may need to send a Xenazine prescription to a specialty pharmacy. Your healthcare provider may also fax a treatment form to Xenazine's manufacturer—Lundbeck—at 1-866-341-5601. They can also call Lundbeck at 1-888-882-6013.

  • How much does Xenazine cost?

    Although Xenazine has a generic tetrabenazine option, it's a specialty medication. As a result, it might be a costly prescription.

    If cost is a concern for the Xenazine brand-name product, Lundbeck does offer a copay assistance program for people with commercial insurance. For eligibility questions, feel free to call Lundbeck at 1-888-882-6013.

    Other potentially helpful resources may also include RxAssist, NeedyMeds, Simplefill, BenefitsCheckUp, Medicare Rights Center, or State Pharmaceutical Assistance Program (SPAP).

  • How do I safely stop taking Xenazine?

    You don't have to slowly stop Xenazine. If you and your healthcare provider would like to discontinue Xenazine, you can stop taking the medication right away. Within 12 to 18 hours of your last Xenazine dose, however, your abnormal and uncontrolled movements may return or worsen.

How Can I Stay Healthy While Taking Xenazine?

If you're taking Xenazine, chances are Huntington's disease (HD) has been negatively affecting your quality of life. You may have tried different approaches or treatments. While living with HD does have its challenges, there are ways to help improve your quality of life. Refer below for some general tips to support your health:

  • Take HD-related medications as recommended by your healthcare provider.
  • Consider support groups or working with a mental health professional to help you find coping strategies to change the way you think, feel, react, or respond to living with HD.
  • Consider visiting the Huntington's Disease Society of America (HDSA) website. This organization offers support for people with HD and their loved ones. HDSA also provides educational tools. It also coordinates support groups on a national level.
  • Find ways to manage your stress.
  • Have a regular routine.
  • Regularly exercise.
  • Use memory aids, reminders, cues, or prompts to help you stay organized and complete tasks.
  • Participate in enjoyable activities.
  • Avoid alcohol and marijuana. Alcohol and marijuana can act as depressants. They may make you more dizzy or drowsy.
  • Avoid tobacco products.

Medical Disclaimer

Verywell Health's drug information is meant for educational purposes only and is not intended to replace medical advice, diagnosis, or treatment from a healthcare provider. Consult your healthcare provider before taking any new medication(s). IBM Watson Micromedex provides some of the drug content, as indicated on the page.

15 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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By Ross Phan, PharmD, BCACP, BCGP, BCPS
Ross is a writer for Verywell with years of experience practicing pharmacy in various settings. She is also a board-certified clinical pharmacist and the founder of Off Script Consults.