Amoxicillin Clavulanate and Warfarin: Drug Interaction Guide

Quick answer: This combination requires caution. Amoxicillin Clavulanate and Warfarin can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Amoxicillin Clavulanate interacts with Warfarin

Broad-spectrum antibiotic suppression of vitamin K-producing gut flora reduces vitamin K availability, enhancing warfarin's anticoagulant effect.

What you should do

Check INR within 3-5 days of starting and after stopping the antibiotic. Counsel patients on bleeding signs and dietary vitamin K consistency.

Key facts

Severity

Moderate — caution required

Mechanism

Broad-spectrum antibiotic suppression of vitamin K-producing gut flora reduces vitamin K availability, enhancing warfari...

Action

Check INR within 3-5 days of starting and after stopping the antibiotic. Counsel patients on bleeding signs and dietary ...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Amoxicillin Clavulanate and Warfarin together?

With caution. Check INR within 3-5 days of starting and after stopping the antibiotic. Counsel patients on bleeding signs and dietary vitamin K consistency.

What is the severity of this interaction?

The interaction between Amoxicillin Clavulanate and Warfarin is classified as Moderate — caution required. Broad-spectrum antibiotic suppression of vitamin K-producing gut flora reduces vitamin K availability, enhancing warfarin's anticoagulant effect.

What should I do if I'm prescribed both?

Check INR within 3-5 days of starting and after stopping the antibiotic. Counsel patients on bleeding signs and dietary vitamin K consistency. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.