This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Warfarin and antibiotics

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The anticoagulant effect of warfarin and other coumarins is reduced by rifamycins.

Antibiotics that enhance the anticoagulant effect include:

  • cephamandole
  • chloramphenicol
  • ciprofloxacin
  • co-trimoxazole
  • erythromycin
  • metronidazole
  • ofloxacin
  • sulphonamides

There is possible enhancement of the anticoagulant effect by:

  • azithromycin
  • aztreonam
  • clarithromycin
  • nalidixic acid
  • neomycin
  • tetracyclines
  • trimethoprim

There is anecdotal evidence that the INR can be altered following a course of oral broad spectrum antibiotic e.g. ampicillin.


Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.