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Warfarin-Rifampin Drug Interaction in a Pediatric Patient

Michael Poon1, Brady S Moffett1, Donald L Yee1

  • 1Department of Pharmacy (MP, BSM), Texas Children's Hospital, Houston, Texas, and Department of Pediatrics (BSM, DLY), Baylor College of Medicine, Houston, Texas.

The Journal of Pediatric Pharmacology and Therapeutics : JPPT : the Official Journal of PPAG
|October 19, 2017
PubMed

Insights

Rifampin significantly reduces warfarin effectiveness in adults. This case study shows amplified warfarin metabolism in a pediatric patient receiving rifampin, highlighting potential risks in children.

Area of Science:

  • Pharmacology
  • Pediatric Medicine
  • Drug Interactions

Background:

  • Warfarin is a common anticoagulant.
  • Rifampin is known to reduce warfarin's efficacy in adults.
  • Limited data exist on rifampin-warfarin interactions in pediatric populations.

Observation:

  • A pediatric patient receiving multiple medications was treated with rifampin.
  • The patient exhibited significantly increased warfarin metabolism.
  • This occurred despite concurrent use of other drugs known to inhibit warfarin metabolism.

Findings:

  • Rifampin can cause extreme increases in warfarin metabolism in pediatric patients.
  • The interaction may be more pronounced in children than in adults.
  • Concurrent medications did not fully counteract rifampin's effect.

Implications:

  • Clinicians should exercise caution when prescribing rifampin to pediatric patients on warfarin.
  • Dosage adjustments for warfarin may be critical in this population.
  • Further research is needed to elucidate the pediatric-specific pharmacokinetics of this drug interaction.

Keywords:
INRpediatricrifampinwarfarin

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