Verapamil and Warfarin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Verapamil interacts with Warfarin

Verapamil inhibits CYP3A4 and P-glycoprotein, modestly increasing warfarin exposure and bleeding risk in some patients.

What you should do

Check INR within 5–7 days of starting, stopping or dose-adjusting verapamil and adjust warfarin dose as needed.

Key facts

Severity

Moderate — caution required

Mechanism

Verapamil inhibits CYP3A4 and P-glycoprotein, modestly increasing warfarin exposure and bleeding risk in some patients.

Action

Check INR within 5–7 days of starting, stopping or dose-adjusting verapamil 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 Verapamil and Warfarin together?

With caution. Check INR within 5–7 days of starting, stopping or dose-adjusting verapamil and adjust warfarin dose as needed.

What is the severity of this interaction?

The interaction between Verapamil and Warfarin is classified as Moderate — caution required. Verapamil inhibits CYP3A4 and P-glycoprotein, modestly increasing warfarin exposure and bleeding risk in some patients.

What should I do if I'm prescribed both?

Check INR within 5–7 days of starting, stopping or dose-adjusting verapamil 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.