Medication Guide
Haloperidol (Haldol) Side Effects and Uses
A plain-language guide to Haloperidol, a typical (first-generation) antipsychotic. Learn how it helps, what it treats, how to take it and which side effects to know about.
Quick answer. Haloperidol (Haldol) is a typical (first-generation) antipsychotic. Common haloperidol side effects include stiff muscles, tremor, restlessness and slow movements. The rare but serious ones, and when to get help, are listed under haloperidol side effects below. Never stop or change your dose on your own.
How Haloperidol Can Help You
Haloperidol is sold as Haldol. It is a strong dopamine blocker that has been used for decades. It is still one of the best drugs for voices, false beliefs and severe agitation. It is often chosen when fast, reliable control of psychosis is needed. Its long-acting shot can help prevent relapse for people who struggle with daily pills.
Severe agitation can calm within hours to days. Voices and false beliefs usually fade over days to several weeks of steady use. People often say the noise and threat start to fade. Daily life feels possible again.
It has a higher risk of movement side effects than newer drugs. Your prescriber uses the lowest dose that helps. They also watch for stiffness, tremor or restlessness.
Uses for Haloperidol
- Schizophrenia
- Tics and vocal sounds of Tourette's disorder
- Sudden psychosis
- Severe agitation or aggression
- Delirium in the hospital (off-label)
- Hard-to-control nausea in the hospital (off-label)
How to Take Haloperidol
It comes as tablets and a liquid. You can take them with or without food. There is also a short-acting shot for urgent care. A long-acting decanoate shot is used for ongoing care. Your prescriber decides the form and dose. They aim for the lowest dose that controls symptoms, since movement side effects rise with dose.
Your prescriber will check often for early movement symptoms. These include stiff muscles, tremor, restlessness or slow movement. They will also watch for new movements of the face, tongue or limbs. These could be a sign of tardive dyskinesia. Report them early, because many can be treated.
If you miss a dose, take it when you remember, unless the next dose is near. Never double up. Do not stop haloperidol all at once. The risk of relapse is high. Any change should be slow and planned with your prescriber.
Haloperidol Side Effects
Common Side Effects
- Stiff muscles
- Tremor
- Restlessness (akathisia)
- Slow movements
- Sleepiness
- Dry mouth
- Constipation
- High prolactin (breast or period changes)
- Blurred vision
Serious: Get Medical Help Promptly
- Death risk in older adults with dementia and psychosis (boxed warning)
- Tardive dyskinesia (movements you cannot control, which may last)
- Neuroleptic malignant syndrome (high fever, stiff muscles, confusion)
- QT prolongation and serious heart rhythm changes, more likely with IV use
- Sudden, painful spasms of the neck, eyes or jaw (acute dystonia)
- Seizures in people prone to them
What Haloperidol Is
Haloperidol is an older, first-generation antipsychotic. It is also called a typical antipsychotic. It belongs to a drug family called butyrophenones. Haldol is its best-known brand name. But most people now get the generic. It was made in the late 1950s. It is on the World Health Organization's list of essential medicines.
The FDA label approves it for schizophrenia. It also approves it for the tics and vocal sounds of Tourette's disorder. Hospitals use it for other short-term needs too, such as delirium or hard-to-control nausea. Your prescriber explains why it is being used in your case.
How Haloperidol Works
Its main action is blocking dopamine D2 receptors. In the brain pathways linked to psychosis, this quiets extra signals. Those signals are thought to drive voices and false beliefs. It acts much less on serotonin than newer drugs do.
The same dopamine block in the brain's movement areas explains its best-known side effects. That is why stiffness, tremor and restlessness are more common than with most newer drugs. Blocking dopamine also raises prolactin. In the part of the brain that controls nausea, it can reduce vomiting. That is one reason hospitals sometimes use it.
Haloperidol Side Effects and How They Are Managed
Movement side effects often show up in the first days to weeks. Prescribers may treat them by lowering the dose. Or they may add a medicine such as benztropine. The risk of tardive dyskinesia grows with time and total dose. That is a lasting movement problem. So regular check-ins matter even when you feel well.
Get help right away for fainting or a racing heartbeat. The same goes for high fever with stiff muscles, confusion, or trouble swallowing or breathing. It can make it harder for your body to cool down. So avoid overheating and drink enough fluids. Sleepiness can affect driving. Wait until you know how it affects you.
Before You Start Haloperidol
People with Parkinson's disease should not take it. It blocks the dopamine that Parkinson's care tries to restore. Tell your prescriber about heart rhythm problems and low potassium or magnesium. Also share seizures and thyroid disease. Tell them about any past reaction to an antipsychotic.
Avoid alcohol and other sedating drugs unless your prescriber says otherwise. Other drugs that lengthen the QT interval raise heart rhythm risk. Carbamazepine and rifampin can lower its levels. Lithium taken with it needs close watching. Like all drugs of its kind, it has a boxed warning. It is about a higher risk of death in older adults with dementia and psychosis. Pregnancy plans are a talk to have with your prescriber.
Is Haloperidol Right for You?
Only a full evaluation with a prescriber can tell you if Haloperidol fits your symptoms, history and goals. Harpal Singh, PMHNP-BC offers psychiatric evaluations and ongoing medication management by telehealth anywhere in California.
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Articles About Haloperidol
Related Medication Guides
Other guides in the same group, written the same simple way. Being in one group does not mean you can swap one medicine for another.
- Olanzapine (Zyprexa), atypical antipsychotic
- Paliperidone (Invega), atypical antipsychotic
- Quetiapine (Seroquel), atypical antipsychotic
- Risperidone (Risperdal), atypical antipsychotic
- Ziprasidone (Geodon), atypical antipsychotic
- Aripiprazole (Abilify), atypical antipsychotic
FAQ
Questions About Haloperidol
What is haloperidol used for?
It is FDA approved for schizophrenia. It is also approved for the tics and vocal sounds of Tourette's disorder. It is widely used for sudden psychosis and severe agitation too. In hospitals it is sometimes used for delirium or hard-to-control nausea.
Is Haldol the same as haloperidol?
Yes. Haloperidol is the generic name and Haldol is the brand name. Most people today get the generic. The long-acting shot is often called haloperidol decanoate or Haldol Decanoate.
What are the most common side effects of Haldol?
The most common are movement effects such as stiffness, tremor, slow movement and inner restlessness. Sleepiness, dry mouth and constipation are also common. Report any new movement problem early, since many can be treated.
Do haloperidol side effects go away?
Many can be treated. Your prescriber may lower the dose or add a medicine such as benztropine to ease stiffness, tremor or restlessness. Tardive dyskinesia is different, since it may last. That is why regular check-ins matter, even when you feel well.
Which haloperidol side effects need emergency care?
Get help right away for fainting or a racing heartbeat. The same goes for a high fever with stiff muscles or confusion, or trouble swallowing or breathing. Sudden, painful spasms of the neck, eyes or jaw also need prompt care. In an emergency, call 911.
Why use an older medicine like haloperidol instead of a newer one?
It works well and has been used for decades. It comes in flexible forms, including a long-acting shot. For some people it controls symptoms better than newer options. The tradeoff is a higher risk of movement side effects, which your prescriber will watch closely.
What movement side effects should I watch for?
Watch for stiff muscles, tremor, not being able to sit still, sudden muscle spasms or any new movements of the face, tongue or limbs. Report these to your prescriber soon. Many are treatable with a dose change or added medicine, and early reporting helps prevent lasting problems.
What is the haloperidol decanoate injection?
It is a long-acting form of haloperidol given as a shot into a muscle, about once a month. It releases medicine slowly and steadily, so there is no daily pill to remember. Shots are given in person, so ask your prescriber how that would work for you.
Does haloperidol cause weight gain?
Haloperidol causes less weight gain and fewer blood sugar or cholesterol problems than many newer antipsychotics. Its main tradeoff is movement side effects instead. Your prescriber will still check your overall health from time to time.
Is haloperidol a sedative?
It is an antipsychotic, not a sedative, but it can cause drowsiness. Its calming effect on severe agitation comes mostly from its action on dopamine. Your prescriber chooses it for psychosis or agitation, not for sleep.
Can haloperidol be used for anxiety or sleep?
Haloperidol is not approved for anxiety or insomnia. Its risk of movement side effects usually makes other treatments a better fit for those problems. Talk with your prescriber about safer options if anxiety or sleep is the main concern.
How long does haloperidol take to work?
Severe agitation can calm within hours to days. Voices and false beliefs usually fade over days to several weeks of steady use. Tell your prescriber how you are doing at each visit.
Can haloperidol be stopped once psychosis goes away?
Stopping too early is one of the most common causes of relapse, and relapses can get harder to treat each time. How long to continue depends on your history and diagnosis. Any plan to lower or stop the dose should be slow and made with your prescriber.