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Haloperidol, a first-generation typical antipsychotic, is commonly used worldwide to block dopamine D2 receptors in the brain and exert its antipsychotic action. The medication is used to manage the positive symptoms of schizophrenia, including hallucinations and delusions. Haloperidol has received approval from the U.S. Food and Drug Administration (FDA) for a wide array of clinical applications, while also exhibiting off-label uses. The FDA-approved indications for haloperidol include schizophrenia, Tourette syndrome, and severe behavioral disorders in children, characterized by combative and explosive hyperexcitability, as well as hyperactivity in children, characterized by impulsivity, attention difficulties, aggressiveness, mood fluctuations, and low frustration tolerance. This activity highlights the mechanism of action, administration, adverse event profile, toxicity, monitoring, and pertinent interactions relevant to interprofessional healthcare team members when using haloperidol effectively to manage diverse indications. Objectives: Identify the FDA-approved indications for haloperidol, including schizophrenia, Tourette syndrome, and severe behavioral disorders in children. Screen patients for contraindications, comorbidities, and potential drug interactions before initiating haloperidol therapy. Implement appropriate dosing strategies based on patient characteristics, including age, weight, and underlying conditions. Select haloperidol as a suitable antipsychotic option based on patient characteristics, medical history, and treatment goals. Access free multiple choice questions on this topic.

Toxicities are the exaggerated symptoms of known pharmacological effects and adverse drug reactions. The most prominent toxicities of haloperidol are severe extrapyramidal symptoms, hypotension, and sedation. The patient may appear comatose with severe respiratory depression or shock from hypotension. The extrapyramidal symptoms include akathisia, rigidity, bradykinesia, tremor, and acute dystonia. Haloperidol overdose can cause torsades de pointes, a type of ECG change that leads to arrhythmia or cardiac arrest.[24] As no specific antidote exists, supportive treatment is the mainstay of haloperidol toxicity. If a patient shows signs of toxicity, the clinician should promptly consider performing gastric lavage or emesis induction on the patient, followed by administering activated charcoal. Maintaining the airway, breathing, and circulation are critical for survival. An oropharyngeal airway or an endotracheal tube can help maintain an unobstructed airway. Patients in a comatose state with difficulty breathing or an obstruction in their upper airway often require a tracheostomy. Nasal prongs or facemasks are used to administer supplemental oxygen. Patients with refractory hypoxia often require intubation and mechanical ventilation. Hypotension and circulatory collapse require aggressive treatment with intravenous fluids, concentrated albumin, and vasopressor agents, such as norepinephrine or phenylephrine. Epinephrine should not be used as it can decrease patients' blood pressure levels. Benztropine is used to treat extrapyramidal reactions, including acute dystonia.[41] Propranolol and anticholinergics are used for managing akathisia.[42] ECG and vital signs require regular monitoring, especially for signs of torsades de pointes, QT prolongation, or dysrhythmias. Cardiac monitoring should be continued until the ECG returns to normal. If the patient experiences arrhythmias, which could be life-threatening, prompt management of the condition with appropriate anti-arrhythmic measures should be initiated.[43]

Although haloperidol is a widely used antipsychotic medication, it can cause various adverse effects and toxicities. As a result, healthcare professionals must be familiar with the drug's pharmacology, recognize the signs of toxicity, and know how to manage any adverse effects that may arise while using the medicine. Therefore, a proper history and physical examination are necessary before initiating haloperidol in patients. The recommended approach for prescribing or ordering haloperidol is as follows: Healthcare providers, including physicians and advanced practice practitioners, should prescribe haloperidol for suitable indications. Psychiatrists are responsible for the comprehensive care of patients undergoing haloperidol therapy. Pharmacists are critical in ensuring proper patient dosing and notifying clinicians of potential drug interactions. Nurses specializing in this domain should thoroughly review medication administration records to prevent any potential administration errors. Emergency department physicians and triage nurses are the primary responders in the event of an acute haloperidol overdose. Intensivists are responsible for ensuring appropriate ICU care and vigilant monitoring of patients during their hospital stay. In severe haloperidol toxicity, seeking consultation from a medical toxicologist is recommended. The American Psychiatric Association guidelines recommend that individuals with schizophrenia experiencing their initial episode of psychosis should receive care within a coordinated specialty care program.[3] Effective interprofessional coordination through shared decision-making among physicians, advanced practice practitioners, nurses, specialists, pharmacists, and other healthcare providers is essential to enhance patient outcomes and minimize or eradicate adverse events associated with haloperidol therapy. The above-illustrated interprofessional healthcare team approach enhances the efficacy of haloperidol therapy, resulting in reduced adverse events and improved patient outcomes.