Ciprofloxacin and Warfarin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Ciprofloxacin interacts with Warfarin

Ciprofloxacin inhibits CYP1A2 and CYP3A4 and may disrupt vitamin K-producing gut flora, potentiating warfarin's anticoagulant effect.

What you should do

Monitor INR within 3-5 days of starting ciprofloxacin and adjust warfarin dose if INR rises significantly.

Key facts

Severity

Moderate — caution required

Mechanism

Ciprofloxacin inhibits CYP1A2 and CYP3A4 and may disrupt vitamin K-producing gut flora, potentiating warfarin's anticoag...

Action

Monitor INR within 3-5 days of starting ciprofloxacin and adjust warfarin dose if INR rises significantly.

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 Ciprofloxacin and Warfarin together?

With caution. Monitor INR within 3-5 days of starting ciprofloxacin and adjust warfarin dose if INR rises significantly.

What is the severity of this interaction?

The interaction between Ciprofloxacin and Warfarin is classified as Moderate — caution required. Ciprofloxacin inhibits CYP1A2 and CYP3A4 and may disrupt vitamin K-producing gut flora, potentiating warfarin's anticoagulant effect.

What should I do if I'm prescribed both?

Monitor INR within 3-5 days of starting ciprofloxacin and adjust warfarin dose if INR rises significantly. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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