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Haldol Decanoate (injection)

Generic name: haloperidol (injection) [ HAL-oh-PER-i-dol ]
Brand names: Haldol Decanoate, Haldol injection
Drug class: Miscellaneous antipsychotic agents

Medically reviewed by on Aug 16, 2023. Written by Cerner Multum.

What is Haldol Decanoate?

Haldol Decanoate is an antipsychotic medicine that is used to treat schizophrenia.

Haldol Decanoate is also used to control motor and speech tics in people with Tourette's syndrome.

Haldol Decanoate is sometimes used in people who are unable to take the medicine by mouth.

Haldol Decanoate may also be used for purposes not listed in this medication guide.

Haldol Decanoate side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

High doses or long-term use of haloperidol can cause a serious movement disorder that may not be reversible. The longer you use Haldol Decanoate, the more likely you are to develop this disorder, especially if you are a diabetic or an older adult.

Haldol Decanoate may cause serious side effects. Call your doctor at once if you have:

Serious side effects may be more likely in older adults.

Common side effects of Haldol Decanoate may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Haldol Decanoate is not approved for use in older adults with dementia-related psychosis.

Before taking this medicine

You should not receive Haldol Decanoate if you are allergic to Haldol Decanoate, or if you have:

Haldol Decanoate may increase the risk of death in older adults with dementia-related psychosis and is not approved for this use.

Tell your doctor if you have ever had:

Using antipsychotic medicine in the last 3 months of pregnancy may cause serious problems in the newborn. If you get pregnant, tell your doctor right away. Do not stop the medicine without your doctor's advice.

You should not breastfeed while using Haldol Decanoate.

How is Haldol Decanoate given?

You may be given oral Haldol Decanoate to take by mouth for a short time before you are treated with this medicine.

Haldol Decanoate is injected into a muscle by a healthcare provider, usually once every 3 to 4 weeks as needed.

If you use this medicine long-term, you may need frequent medical tests.

Do not stop using Haldol Decanoate suddenly after long-term use, or you could have unpleasant withdrawal symptoms. Ask your doctor how to safely stop using this medicine.

What happens if I miss a dose?

Call your doctor for instructions if you miss an appointment for your Haldol Decanoate.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222 if you have overdose symptoms (extreme drowsiness, severe tremors or muscle stiffness, weak or shallow breathing, fainting). An overdose of haloperidol can be fatal.

What should I avoid while receiving Haldol Decanoate?

Avoid driving or hazardous activity until you know how Haldol Decanoate will affect you. Dizziness or drowsiness can cause falls, accidents, or severe injuries.

Avoid drinking alcohol. Dangerous side effects could occur.

Avoid becoming overheated or dehydrated during exercise and in hot weather. You may be more prone to heat stroke while you are using Haldol Decanoate.

What other drugs will affect Haldol Decanoate?

Sometimes it is not safe to use certain medications at the same time. Some drugs can affect your blood levels of other drugs you take, which may increase side effects or make the medications less effective.

Haldol Decanoate can cause a serious heart problem. Your risk may be higher if you also use certain other medicines for infections, asthma, heart problems, high blood pressure, depression, mental illness, cancer, malaria, or HIV.

Using Haldol Decanoate with other drugs that make you drowsy can worsen this effect. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures.

Tell your doctor about all your other medicines, especially:

This list is not complete. Other drugs may affect Haldol Decanoate, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.