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Related Experiment Videos

Fluvoxamine interaction with warfarin.

Kristi K Limke1, Angela R Shelton, Ellie S Elliott

  • 1Drake University, Des Moines, IA, USA.

The Annals of Pharmacotherapy
|November 28, 2002
PubMed
Summary
This summary is machine-generated.

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Fluvoxamine can significantly increase the anticoagulant effect of warfarin, leading to elevated international normalized ratio (INR) levels. Close monitoring is crucial, especially in elderly patients, due to potential drug interactions.

Area of Science:

  • Pharmacology
  • Drug Interactions
  • Geriatric Medicine

Background:

  • Warfarin is a widely prescribed anticoagulant.
  • Fluvoxamine is a selective serotonin reuptake inhibitor (SSRI) used for depression.
  • Elderly patients are often on multiple medications, increasing the risk of drug interactions.

Observation:

  • A case report details an elderly patient experiencing an elevated international normalized ratio (INR) after switching from citalopram to fluvoxamine.
  • The elevated INR persisted for approximately seven days despite discontinuation of fluvoxamine.
  • The patient had a complex medical history including atrial fibrillation, necessitating warfarin therapy.

Findings:

  • Fluvoxamine inhibits cytochrome P450 isoenzymes (CYP1A2, CYP2C9, CYP2C19, CYP3A4) involved in warfarin metabolism.

Related Experiment Videos

  • The drug interaction can lead to a significant increase in warfarin's anticoagulant effect.
  • Fluvoxamine's long elimination half-life, particularly in the elderly, contributes to prolonged elevated INR.

    • Implications:

    • Coadministration of warfarin and fluvoxamine requires careful monitoring for increased anticoagulant effect.
    • Healthcare providers should be vigilant for potential drug interactions involving fluvoxamine and warfarin in elderly patients.
    • This case highlights the importance of considering drug metabolism and elimination when prescribing medications to older adults.