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Europe — EMA

Haldol

Learn about Haloperidol injection (Haldol): uses, side effects, precautions, and drug interactions for acute psychiatric care.

Haloperidol

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What is Haloperidol?

Haldol is the trade name for the injectable form of haloperidol, a butyrophenone antipsychotic supplied as a sterile solution for intramuscular administration. It is a prescription‑only medication marketed in the European Union and acts as a dopamine D2‑receptor antagonist. The drug is packaged in ampoules for rapid delivery when acute psychiatric symptoms require immediate control, and it carries ATC code N05AD01 for use under medical supervision.

What is Haloperidol used for?

Haloperidol injection is indicated for several acute psychiatric conditions where rapid symptom control is needed.

- Schizophrenia, especially during acute exacerbations - Acute psychotic episodes unrelated to schizophrenia - Manic episodes in bipolar disorder - Severe agitation or aggression that poses safety risks - Pre‑operative sedation in patients with psychosis

What are the side effects of Haloperidol?

Side effects of intramuscular haloperidol vary in frequency and severity.

Common: - Drowsiness or sedation - Extrapyramidal symptoms such as tremor or rigidity - Dry mouth - Blurred vision - Constipation

Serious: - Neuroleptic malignant syndrome - Tardive dyskinesia - Severe hypotension - Cardiac arrhythmias (QT prolongation) - Agranulocytosis (rare)

What precautions apply to Haloperidol?

Before prescribing haloperidol injection, clinicians should evaluate several safety considerations.

- History of cardiovascular disease or prolonged QT interval - Current or past movement disorders, including Parkinson’s disease - Severe hepatic or renal impairment - Pregnancy, lactation, or plans for pregnancy (risk unknown) - Concomitant use of other dopamine‑blocking agents - Elderly patients, especially with dementia‑related psychosis, due to higher mortality risk

What does Haloperidol interact with?

Haloperidol can interact with other medicines, affecting its efficacy or safety.

Avoid: - Other antipsychotics or dopamine antagonists - Medications that prolong QT interval (e.g., certain antiarrhythmics, macrolide antibiotics) - Strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin)

Use with caution: - CNS depressants such as benzodiazepines or opioids - Anticholinergic agents (may mask extrapyramidal symptoms) - CYP3A4 inducers (e.g., carbamazepine, rifampin) which may reduce haloperidol levels

Frequently asked questions

What is the mechanism of action of haloperidol injection?+
Haloperidol works primarily as a dopamine D2 receptor antagonist, reducing dopaminergic neurotransmission in the brain.
When is intramuscular haloperidol preferred over oral formulations?+
Injectable haloperidol is often used when rapid control of severe agitation, acute psychosis, or mania is required, or when the patient cannot take oral medication.
Can haloperidol injection be used in patients with a history of heart rhythm problems?+
Caution is advised for patients with known QT interval prolongation or other cardiac conduction disorders, and ECG monitoring may be recommended.
What are common side effects that patients should expect after a haloperidol IM dose?+
Typical side effects include drowsiness, dry mouth, blurred vision, constipation, and mild extrapyramidal symptoms such as tremor or rigidity.
How should haloperidol injection be stored before use?+
The product should be kept in its original packaging, protected from light, and stored at controlled room temperature as specified by the manufacturer.
Is haloperidol injection safe during pregnancy?+
The safety of haloperidol during pregnancy has not been fully established; clinicians must weigh potential benefits against unknown risks.
What monitoring is recommended after administering haloperidol IM?+
Patients should be observed for signs of extrapyramidal reactions, changes in blood pressure, cardiac rhythm abnormalities, and rare but serious conditions like neuroleptic malignant syndrome.
Can haloperidol interact with antibiotics that affect the QT interval?+
Yes, co‑administration with antibiotics known to prolong QT (e.g., macrolides) should be avoided or closely monitored.
What should be done if a patient develops severe extrapyramidal symptoms after a haloperidol injection?+
Healthcare providers may consider administering an anticholinergic agent such as benztropine or diphenhydramine to alleviate the symptoms.
Is dose adjustment needed for patients with liver or kidney impairment?+
Dose adjustments may be necessary for individuals with severe hepatic or renal dysfunction; dosing should be individualized by the prescriber.
How long does the effect of a single intramuscular haloperidol dose typically last?+
The therapeutic effect can last from several hours up to a day, depending on the dose and individual patient metabolism.
Are there any special considerations for using haloperidol in elderly patients?+
Elderly patients, especially those with dementia‑related psychosis, have an increased risk of mortality and should be treated with the lowest effective dose and close monitoring.
Information provided on this page is for educational use by procurement and clinical professionals. Always consult a licensed healthcare provider for medical advice and prescribing decisions. GNH USA supplies this product subject to applicable regulatory and licensing requirements.
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Product details

Drug
Haloperidol
Route
Intramuscular Use
Manufacturer
Essential Pharma Limited
Origin
EU

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