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Interaction between warfarin and propranolol.

A K Scott, B K Park, A M Breckenridge

    British Journal of Clinical Pharmacology
    |May 1, 1984
    PubMed
    Summary
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    Propranolol slightly increased warfarin concentration in humans, but did not affect prothrombin time. In rabbits, propranolol shortened warfarin

    Area of Science:

    • Pharmacology
    • Drug Interactions
    • Clinical Pharmacology

    Background:

    • Warfarin is a widely prescribed anticoagulant with a narrow therapeutic index.
    • Propranolol is a common beta-blocker used for various cardiovascular conditions.
    • Understanding potential drug interactions is crucial for patient safety.

    Purpose of the Study:

    • To investigate the pharmacokinetic and pharmacodynamic interaction between propranolol and warfarin.
    • To assess the impact of propranolol on warfarin's efficacy and safety profile.

    Main Methods:

    • A study involving six healthy volunteers receiving a low-dose warfarin protocol.
    • A parallel study conducted in New Zealand white rabbits.
    • Measurement of warfarin concentration, prothrombin time, elimination half-life, volume of distribution, and clearance.

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    Main Results:

    • Warfarin concentration (Cmin) increased by 14.7% in volunteers with propranolol co-administration (P < 0.02).
    • No significant change in prothrombin time was observed in human volunteers.
    • In rabbits, propranolol significantly reduced warfarin's elimination half-life and volume of distribution, but not clearance.

    Conclusions:

    • Propranolol may alter warfarin pharmacokinetics, leading to a small but potentially clinically significant increase in warfarin concentration.
    • The observed changes, particularly the reduced half-life in rabbits, warrant further investigation due to warfarin's narrow therapeutic index.
    • Clinicians should be aware of this potential interaction when prescribing propranolol to patients on warfarin therapy.