Fluoxetine and Warfarin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Fluoxetine interacts with Warfarin

Fluoxetine can inhibit CYP2C9 and CYP2C19 and also impairs platelet serotonin uptake. The combination may increase bleeding risk through pharmacokinetic and pharmacodynamic mechanisms.

What you should do

Monitor INR and bleeding symptoms after initiation or dose changes; consider an antidepressant with lower interaction potential if bleeding risk is high.

Key facts

Severity

Moderate — caution required

Mechanism

Fluoxetine can inhibit CYP2C9 and CYP2C19 and also impairs platelet serotonin uptake. The combination may increase bleed...

Action

Monitor INR and bleeding symptoms after initiation or dose changes; consider an antidepressant with lower interaction po...

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 Fluoxetine and Warfarin together?

With caution. Monitor INR and bleeding symptoms after initiation or dose changes; consider an antidepressant with lower interaction potential if bleeding risk is high.

What is the severity of this interaction?

The interaction between Fluoxetine and Warfarin is classified as Moderate — caution required. Fluoxetine can inhibit CYP2C9 and CYP2C19 and also impairs platelet serotonin uptake. The combination may increase bleeding risk through pharmacokinetic and pharmacodynamic mechanisms.

What should I do if I'm prescribed both?

Monitor INR and bleeding symptoms after initiation or dose changes; consider an antidepressant with lower interaction potential if bleeding risk is high. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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