Haldol (Haloperidol)

Haloperidol is prescribed for several psychiatric and neurological conditions where dopamine blockade is beneficial.

• Schizophrenia, for both acute exacerbations and long‑term maintenance therapy to reduce positive symptoms such as hallucinations and delusions.
• Acute psychosis or severe agitation, where rapid control of symptoms is required, often administered in hospital settings.
• Tourette syndrome, particularly for patients with persistent motor and vocal tics not adequately controlled by first‑line agents.
• Short‑term management of acute mania, delirium, or severe behavioral disturbance when alternative antipsychotics are contraindicated.
• Adjunctive use in dementia‑related aggression or psychosis, recognizing that this is an off‑label indication in many jurisdictions.

Haloperidol may cause a range of side effects, varying in frequency and severity.

Common

• Drowsiness or sedation.
• Extrapyramidal symptoms such as tremor, rigidity, akathisia, or dystonia.
• Dry mouth, constipation, or blurred vision.
• Weight gain or increased appetite.
• Orthostatic hypotension.
• Nausea or vomiting.

Serious

• Tardive dyskinesia, a potentially irreversible movement disorder.
• Neuroleptic malignant syndrome, characterized by fever, muscle rigidity, and autonomic instability.
• Cardiac arrhythmias, including QT prolongation, which can lead to serious ventricular tachyarrhythmias.

When prescribing haloperidol, clinicians consider several precautions to minimize risks and ensure safe use.

• Assess patient history for cardiovascular disease, as haloperidol can affect heart rhythm.
• Monitor for signs of extrapyramidal symptoms, especially in elderly patients.
• Use the lowest effective dose for the shortest duration needed.
• Evaluate liver and kidney function periodically, since impairment may alter drug clearance.
• Caution in patients with a history of seizures or neuroleptic malignant syndrome.
• Avoid use during pregnancy unless benefits outweigh risks, due to limited safety data.

Haloperidol can interact with other medications, influencing its effectiveness or increasing adverse effects.

Avoid

• Other dopamine‑blocking agents, which may amplify extrapyramidal side effects.
• Medications that prolong the QT interval, such as certain antiarrhythmics or macrolide antibiotics.
• Strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin) that raise haloperidol plasma levels.

Use with caution

• CNS depressants like benzodiazepines or opioids, which can increase sedation.
• Anticholinergic drugs, which may mask early signs of extrapyramidal symptoms.
• Lithium, as combined use may affect neurological status.