Key result
Massive loperamide overdose triggers torsades de pointes via combined sodium and potassium channel blockade.
Why the study?
Loperamide misuse at supratherapeutic doses has emerged as an underrecognized cause of life-threatening ventricular arrhythmias via combined potassium and sodium channel blockade.
Case Report
Massive loperamide toxicity can cause refractory torsades de pointes due to combined potassium and sodium channel blockade, potentially requiring source control for a colonic pill bezoar when standard arrhythmia management fails.
Loperamide misuse warrants ECG surveillance for QT/QRS toxicity in unexplained TdP; case reports leave open incidence and optimal management strategies.
Loperamide misuse at supratherapeutic doses has emerged as an underrecognized cause of life-threatening ventricular arrhythmias. At massive doses, loperamide produces combined potassium and sodium channel blockade, leading to QT interval prolongation and QRS widening that create a substrate for torsades de pointes (TdP). Standard management focuses on arrhythmia suppression with electrolyte repletion, intravenous magnesium, sodium bicarbonate, and chronotropic support with isoproterenol or temporary pacing.
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Ramsaran et al. (2026) conducted a case report in Loperamide toxicity and Torsades de Pointes. Loperamide misuse was evaluated. Massive loperamide toxicity causes combined potassium and sodium channel blockade, leading to QT prolongation, QRS widening, and torsades de pointes.
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