Levofloxacin and Warfarin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Levofloxacin interacts with Warfarin

Levofloxacin alters gut flora producing vitamin K and may displace warfarin from plasma proteins, enhancing the anticoagulant effect.

What you should do

Monitor INR within 3–5 days of starting levofloxacin and adjust warfarin dose as needed.

Key facts

Severity

Moderate — caution required

Mechanism

Levofloxacin alters gut flora producing vitamin K and may displace warfarin from plasma proteins, enhancing the anticoag...

Action

Monitor INR within 3–5 days of starting levofloxacin and 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 Levofloxacin and Warfarin together?

With caution. Monitor INR within 3–5 days of starting levofloxacin and adjust warfarin dose as needed.

What is the severity of this interaction?

The interaction between Levofloxacin and Warfarin is classified as Moderate — caution required. Levofloxacin alters gut flora producing vitamin K and may displace warfarin from plasma proteins, enhancing the anticoagulant effect.

What should I do if I'm prescribed both?

Monitor INR within 3–5 days of starting levofloxacin and 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.