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    Selected Anticoagulants (Vit K antagonists)/Propranolol

    This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.

    Medical warning:

    Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.

    How the interaction occurs:

    The cause of the interaction is not known. Propranolol may increase the effects of warfarin.

    What might happen:

    You may experience an increased chance for bleeding.

    What you should do about this interaction:

    If you experience bleeding from your gums, nosebleeds, unusual bruising, or dark stools, contact your doctor.Your healthcare professionals (e.g. doctor or pharmacist) may already be aware of this drug interaction and may be monitoring you for it. If your doctor prescribes these medicines together, you may need to check your bleeding times more often. It may be necessary to adjust your dose of warfarin. Do not start, stop, or change the dosage of any medicine before checking with them first.


    1.Bax ND, Lennard MS, Tucker GT, Woods HF, Porter NR, Malia RG, Preston FE. The effect of beta-adrenoceptor antagonists on the pharmacokinetics and pharmacodynamics of warfarin after a single dose. Br J Clin Pharmacol 1984 May;17(5):553-7.

    2.Scott AK, Park BK, Breckenridge AM. Interaction between warfarin and propranolol. Br J Clin Pharmacol 1984 May;17(5):559-64.

    3.Bax NDS, Lennard MS, Al-Asady S, Deacon CS, Tucker GT, Woods HF. Inhibition of drug metabolism by beta-adrenoceptor antagonists. Drugs 1983 Mar;25(Suppl 2):121-6.

    4.Ryan JR. Clinical pharmacology of acebutolol. Am Heart J 1985 May;109(5 Pt 2):1131-6.

    5.Lowenthal DT, Porter RS, Saris SD, Bies CM, Slegowski MB, Staudacher A. Clinical pharmacology, pharmacodynamics and interactions with esmolol. Am J Cardiol 1985 Oct 23;56(11):14F-18F.

    6.Spahn H, Kirch W, Mutschler E, Ohnhaus EE, Kitteringham NR, Logering HJ, Paar D. Pharmacokinetic and pharmacodynamic interactions between phenprocoumon and atenolol or metoprolol. Br J Clin Pharmacol 1984;17 Suppl 1:97S-102S.

    Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, expect as may be authorized by the applicable terms of use.

    CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.

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