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Drugs Affecting GI Tract Motility: Opioids as Antidiarrheal Agents01:17

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Cardiac conduction disturbance after loperamide abuse.

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Abusing the over-the-counter medication loperamide can cause dangerous heart problems. This case series highlights the severe cardiac risks, including life-threatening arrhythmias, associated with loperamide abuse.

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Area of Science:

  • Clinical Toxicology
  • Cardiology
  • Pharmacology

Background:

  • Opioid abuse is a significant public health issue in the US.
  • Loperamide, an over-the-counter antidiarrheal, has peripheral mu-opioid receptor activity.
  • Online discussions reveal loperamide's use for opioid withdrawal and recreational abuse.

Observation:

  • This observational case series identified 5 patients with a history of loperamide abuse.
  • Three of these patients presented with life-threatening cardiac arrhythmias.
  • One patient experienced recurrent arrhythmias upon resuming loperamide use.

Findings:

  • High loperamide concentrations, significantly exceeding therapeutic levels, were detected in patients.
  • Cardiac conduction disturbances were temporally linked to loperamide abuse.
  • Discontinuation of loperamide led to the complete resolution of cardiac abnormalities.

Implications:

  • Increasing abuse of loperamide as an opioid substitute may occur due to efforts to restrict prescription opioid diversion.
  • Clinicians and toxicologists must be aware of the potential for severe cardiac toxicity from loperamide abuse.
  • Reporting such cases to regulatory bodies like the FDA is crucial for public health awareness.