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Loperamide Cardiac Toxicity: Pathophysiology, Presentation, and Management.

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Area of Science:

  • Pharmacology
  • Cardiology
  • Toxicology

Background:

  • Loperamide, an opioid anti-diarrheal, is safe at standard doses.
  • Misuse of loperamide in high doses is increasing for euphoric or withdrawal effects.
  • This misuse carries risks of central opioid toxicity and fatal cardiac dysrhythmias.

Purpose of the Study:

  • To review the pharmacology of loperamide.
  • To describe the clinical presentation, pathophysiology, and management of loperamide-induced cardiac toxicity.

Main Methods:

  • Literature review on loperamide pharmacology and toxicity.
  • Analysis of clinical presentations and electrocardiographic findings.
  • Discussion of management strategies for cardiac and opioid toxicity.

Main Results:

  • High loperamide concentrations alter cardiac action potential, leading to QT-prolongation, QRS widening, and torsades de pointes.
  • Patients present with syncope and severe ECG abnormalities.
  • Management includes loperamide discontinuation, opioid reversal if needed, and cardiac interventions.

Conclusions:

  • Loperamide misuse poses significant cardiac risks, including potentially fatal arrhythmias.
  • Prompt diagnosis and management are essential.
  • Addressing underlying opioid use disorder is critical for long-term patient care.