Generic Name: Haloperidol Decanoate Injection (HAL oh PER i dol DEK a NOE ate)
Brand Name: Haldol Decanoate
Medically reviewed by Drugs.com. Last updated on Feb 7, 2019.
- There is a higher chance of death in older adults who take haloperidol decanoate injection for mental problems caused by dementia. Most of the deaths were linked to heart disease or infection. This medicine is not approved to treat mental problems caused by dementia.
Uses of Haloperidol Decanoate Injection:
- It is used to treat schizophrenia.
- It may be given to you for other reasons. Talk with the doctor.
What do I need to tell my doctor BEFORE I take Haloperidol Decanoate Injection?
- If you have an allergy to haloperidol or any other part of haloperidol decanoate injection.
- If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
- If you have Parkinson's disease.
- If you are very sleepy.
- If you are breast-feeding. Do not breast-feed while you take haloperidol decanoate injection.
This is not a list of all drugs or health problems that interact with haloperidol decanoate injection.
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take haloperidol decanoate injection with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
What are some things I need to know or do while I take Haloperidol Decanoate Injection?
- Tell all of your health care providers that you take haloperidol decanoate injection. This includes your doctors, nurses, pharmacists, and dentists.
- Avoid driving and doing other tasks or actions that call for you to be alert until you see how haloperidol decanoate injection affects you.
- Have blood work checked as you have been told by the doctor. Talk with the doctor.
- If you have high blood sugar (diabetes), you will need to watch your blood sugar closely.
- Avoid drinking alcohol while taking haloperidol decanoate injection.
- Talk with your doctor before you use other drugs and natural products that slow your actions.
- Sudden death and heartbeats that are not normal have happened with haloperidol decanoate injection. Very high doses raise the chance of these problems. Tell your doctor if you have a heartbeat that is not normal like long QT on ECG, electrolyte problems like low potassium or magnesium levels, heart problems, low thyroid function, or a family member that has a long QT on ECG. Tell your doctor if you take any drugs that may raise the chance of a heartbeat that is not normal. Ask your doctor if you are not sure. Talk with your doctor.
- A very bad and sometimes deadly health problem called neuroleptic malignant syndrome (NMS) may happen. Call your doctor right away if you have any fever, muscle cramps or stiffness, dizziness, very bad headache, confusion, change in thinking, fast heartbeat, heartbeat that does not feel normal, or are sweating a lot.
- Be careful in hot weather or while being active. Drink lots of fluids to stop fluid loss.
- Low white blood cell counts have happened with drugs like this one. This may lead to a higher chance of getting an infection. Deadly infections have rarely happened. Tell your doctor if you have ever had a low white blood cell count. Call your doctor right away if you have signs of infection like fever, chills, or sore throat. Talk with your doctor.
- If you also take lithium, talk with your doctor. A few people who were taking haloperidol decanoate injection along with lithium have had very bad side effects and brain problems that did not go away.
- Dizziness, sleepiness, and feeling less stable may happen with haloperidol decanoate injection. These may lead to falling. Broken bones or other health problems can happen from falling. Talk with the doctor.
- Some people have gotten pneumonia when taking haloperidol decanoate injection. Sometimes, this has been deadly. Call your doctor right away if you have fever, chest pain, cough, shortness of breath, or wheezing.
- If you are 65 or older, use haloperidol decanoate injection with care. You could have more side effects.
- Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using haloperidol decanoate injection while you are pregnant.
- Taking haloperidol decanoate injection in the third trimester of pregnancy may lead to muscle movements that cannot be controlled and withdrawal in the newborn. Talk with the doctor.
How is this medicine (Haloperidol Decanoate Injection) best taken?
Use haloperidol decanoate injection as ordered by your doctor. Read all information given to you. Follow all instructions closely.
- It is given as a shot into a muscle.
- If you have been taking haloperidol decanoate injection on a regular basis and you stop it all of a sudden, you may have signs of withdrawal. Do not stop taking haloperidol decanoate injection all of a sudden without calling your doctor. Tell your doctor if you have any bad effects.
What do I do if I miss a dose?
- Call your doctor to find out what to do.
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Trouble controlling body movements, twitching, change in balance, trouble swallowing or speaking.
- Very bad dizziness or passing out.
- Shakiness, trouble moving around, or stiffness.
- Not able to pass urine.
- Feeling very tired or weak.
- Any unexplained bruising or bleeding.
- Change in eyesight.
- Hallucinations (seeing or hearing things that are not there).
- Mood changes.
- Not able to control eye movements.
- Enlarged breasts.
- Not able to get or keep an erection.
- Lowered interest in sex.
- For women, no period.
- Nipple discharge.
- Some people who take haloperidol decanoate injection may get a very bad muscle problem called tardive dyskinesia. This muscle problem may not go away even if haloperidol decanoate injection is stopped. Sometimes, signs may lessen or go away over time after haloperidol decanoate injection is stopped. The risk of tardive dyskinesia may be greater in people with diabetes and in older adults, especially older women. The risk is also greater the longer you take haloperidol decanoate injection or with higher doses. Muscle problems may also occur after short-term use with low doses. Call your doctor right away if you have trouble controlling body movements or if you have muscle problems with your tongue, face, mouth, or jaw like tongue sticking out, puffing cheeks, mouth puckering, or chewing.
- Call your doctor right away if you have a painful erection (hard penis) or an erection that lasts for longer than 4 hours. This may happen even when you are not having sex. If this is not treated right away, it may lead to lasting sex problems and you may not be able to have sex.
What are some other side effects of Haloperidol Decanoate Injection?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Feeling sleepy.
- Dry mouth.
- Upset stomach or throwing up.
- Not hungry.
- Not able to sleep.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.
If OVERDOSE is suspected:
If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
How do I store and/or throw out Haloperidol Decanoate Injection?
- If you need to store haloperidol decanoate injection at home, talk with your doctor, nurse, or pharmacist about how to store it.
- Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
- Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
Consumer information use
- If your symptoms or health problems do not get better or if they become worse, call your doctor.
- Do not share your drugs with others and do not take anyone else's drugs.
- Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
- Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
- Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about haloperidol decanoate injection, please talk with your doctor, nurse, pharmacist, or other health care provider.
- If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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