Haldol

Haldol (haloperidol) is a prescription medication classified as a butyrophenone antipsychotic. It is administered orally and is marketed in the European Union. The drug works by blocking dopamine D2 receptors in the brain, which helps to manage symptoms of several psychiatric conditions. Haloperidol is available only with a doctor's prescription and does not fall under controlled substance schedules.

Haloperidol is indicated for several psychiatric and neurological conditions where dopamine dysregulation contributes to symptoms.

- Management of schizophrenia, including maintenance therapy. - Treatment of acute psychotic episodes. - Control of severe agitation associated with psychiatric disorders. - Reduction of motor and vocal tics in Tourette syndrome. - Adjunctive therapy for other severe behavioral disturbances as determined by a clinician.

Haloperidol may cause a range of side effects, some of which are more frequently observed while others are less common but potentially serious.

Common: - Drowsiness or sedation. - Extrapyramidal symptoms such as tremor, rigidity, or akathisia. - Dry mouth and constipation. - Blurred vision. - Weight gain. - Orthostatic hypotension.

Serious: - Neuroleptic malignant syndrome. - Tardive dyskinesia with long‑term use. - Severe cardiac arrhythmias (QT prolongation). - Hyperprolactinemia leading to hormonal disturbances. - Seizures in predisposed individuals. - Significant worsening of Parkinsonian symptoms.

Before starting haloperidol, clinicians should evaluate several health factors to minimize risks.

- Review patient history for cardiovascular disease, especially arrhythmias. - Assess for prior movement disorders or Parkinsonian symptoms. - Monitor for signs of neuroleptic malignant syndrome during early treatment. - Use caution in patients with hepatic or renal impairment; dose adjustments may be needed. - Evaluate pregnancy status; the safety profile in pregnancy is not well established. - Conduct regular ECG monitoring when high doses or concomitant QT‑prolonging drugs are used. - Educate patients and caregivers about the potential for sudden onset of severe side effects.

Haloperidol can interact with several medication classes, affecting its safety and efficacy.

Avoid: - Other dopamine antagonists or antipsychotics that may increase extrapyramidal risk. - Medications known to prolong the QT interval (e.g., certain antiarrhythmics, macrolide antibiotics). - Strong CYP3A4 inhibitors such as ketoconazole, which can raise haloperidol plasma levels.

Use with caution: - CNS depressants including benzodiazepines and opioids, which may enhance sedation. - Anticholinergic agents that can mask early signs of extrapyramidal symptoms. - CYP2D6 substrates (e.g., metoprolol) as haloperidol may alter their metabolism. - Alcohol, which can increase drowsiness and impair coordination.