Azithromycin and Warfarin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Azithromycin interacts with Warfarin

Azithromycin may alter gut flora that synthesize vitamin K and possibly displace warfarin from protein binding, potentiating anticoagulant effect.

What you should do

Monitor INR more frequently during and for one week after azithromycin therapy; adjust warfarin dose as needed.

Key facts

Severity

Moderate — caution required

Mechanism

Azithromycin may alter gut flora that synthesize vitamin K and possibly displace warfarin from protein binding, potentia...

Action

Monitor INR more frequently during and for one week after azithromycin therapy; adjust warfarin dose as needed.

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 Azithromycin and Warfarin together?

With caution. Monitor INR more frequently during and for one week after azithromycin therapy; adjust warfarin dose as needed.

What is the severity of this interaction?

The interaction between Azithromycin and Warfarin is classified as Moderate — caution required. Azithromycin may alter gut flora that synthesize vitamin K and possibly displace warfarin from protein binding, potentiating anticoagulant effect.

What should I do if I'm prescribed both?

Monitor INR more frequently during and for one week after azithromycin therapy; adjust warfarin dose as needed. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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