Decreased milk drinking causing flecainide toxicity in an older child

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Ben Thompson1, Jasveer Mangat, Chris Barton

  • 1Institute of Child Health, University of Liverpool/Alder Hey Children's Hospital, Liverpool, Merseyside, UK.

BMJ Case Reports
|June 26, 2012
PubMed

Insights

Reduced milk intake in a child led to increased flecainide levels and toxicity. This highlights the importance of dietary interactions for antiarrhythmic drug efficacy and safety in pediatric patients.

Area of Science:

  • Pharmacology
  • Cardiology
  • Pediatrics

Background:

  • Flecainide is a Class IC antiarrhythmic drug used for pediatric tachyarrhythmias.
  • It functions by blocking cardiac sodium channels, slowing electrical conduction.
  • Indications include supraventricular and ventricular tachycardias, and atrial fibrillation.

Observation:

  • Paradoxical proarrhythmia is a known risk with flecainide in children.
  • Evidence suggests milk may reduce flecainide absorption in infants.
  • A case involved an older child with persistently subtherapeutic flecainide levels.

Findings:

  • The child's flecainide levels normalized after reducing milk consumption.
  • Following this dietary change, the child experienced severe flecainide toxicity.
  • Increased flecainide levels correlated with the reduction in milk intake.

Implications:

  • Dietary factors, specifically milk consumption, can significantly impact flecainide bioavailability in children.
  • Close monitoring of flecainide levels and potential drug-food interactions is crucial for pediatric patients.
  • This case underscores the need for individualized treatment approaches considering dietary habits in pediatric antiarrhythmic therapy.

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