Haldol (Haloperidol)

Haldol intramuscular injection is indicated for several acute psychiatric conditions where rapid symptom control is essential.

• Schizophrenia, particularly acute exacerbations or when oral therapy is not feasible.
• Acute psychosis associated with bipolar disorder or other mood disorders.
• Manic episodes that require swift calming of severe agitation.
• Severe agitation or aggression in hospitalized patients, including emergency settings.
• Pre‑operative sedation for patients with known psychotic disorders.

Side effects of haloperidol injection vary in frequency and severity; they are categorized as common or serious based on clinical observations.

Common

• Drowsiness or sedation.
• Dry mouth.
• Constipation.
• Extrapyramidal symptoms such as tremor or rigidity.

Serious

• Neuroleptic malignant syndrome, a rare but life‑threatening reaction.
• Tardive dyskinesia, persistent involuntary movements.
• Cardiac arrhythmias, including QT prolongation.

When prescribing Haldol, clinicians should evaluate patient history and monitor for specific risks to ensure safe use.

• History of cardiovascular disease or prolonged QT interval.
• Parkinson’s disease or other movement disorders.
• Elderly patients, especially those with dementia, due to increased sensitivity.
• Severe hepatic or renal impairment may require dose adjustment.
• Concomitant use of other dopamine‑blocking agents.
• Pregnancy and breastfeeding status should be assessed.

Haloperidol can interact with other medications, affecting its efficacy or increasing the risk of adverse events.

Avoid

• Other antipsychotics or high‑potency dopamine antagonists.
• Medications that prolong the QT interval (e.g., certain antiarrhythmics, macrolide antibiotics).
• Strong CYP3A4 inhibitors such as ketoconazole or clarithromycin.

Use with caution

• CNS depressants including benzodiazepines or opioids.
• Anticholinergic agents, which may mask extrapyramidal symptoms.
• Lithium, which can increase neurotoxic risk.