Imatinib and Warfarin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Imatinib interacts with Warfarin

Imatinib inhibits CYP2C9 and CYP3A4 metabolism of warfarin, potentiating its anticoagulant effect and increasing INR with bleeding risk.

What you should do

Switch to low-molecular-weight heparin where feasible. If warfarin must continue, monitor INR twice weekly when starting or stopping imatinib.

Key facts

Severity

Moderate — caution required

Mechanism

Imatinib inhibits CYP2C9 and CYP3A4 metabolism of warfarin, potentiating its anticoagulant effect and increasing INR wit...

Action

Switch to low-molecular-weight heparin where feasible. If warfarin must continue, monitor INR twice weekly when starting...

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 Imatinib and Warfarin together?

With caution. Switch to low-molecular-weight heparin where feasible. If warfarin must continue, monitor INR twice weekly when starting or stopping imatinib.

What is the severity of this interaction?

The interaction between Imatinib and Warfarin is classified as Moderate — caution required. Imatinib inhibits CYP2C9 and CYP3A4 metabolism of warfarin, potentiating its anticoagulant effect and increasing INR with bleeding risk.

What should I do if I'm prescribed both?

Switch to low-molecular-weight heparin where feasible. If warfarin must continue, monitor INR twice weekly when starting or stopping imatinib. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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