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Warfarin and combined oral contraceptive pill

Authoring team

  • coumarin anticoagulants (e.g. warfarin)
    • use of estrogens and/or progestogens has been associated with both increased and decreased anticoagulant effect of coumarin anticoagulants. Given the lack of consistent evidence a true interaction is unlikely

Reference:

  • Faculty of Sexual & Reproductive Healthcare Clinical Guidance. Drug Interactions with Hormonal Contraception.Clinical Effectiveness Unit; January 2011.

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