Quinidine and Rifampicin: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Quinidine and Rifampicin unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Quinidine interacts with Rifampicin

Rifampicin strongly induces CYP3A4 and P-glycoprotein, increasing quinidine clearance and reducing antiarrhythmic exposure. Loss of efficacy may precipitate arrhythmia recurrence.

What you should do

Avoid the combination where possible. If rifampicin is essential, involve cardiology, monitor ECG and clinical response, and adjust antiarrhythmic therapy carefully.

Key facts

Severity

Major — avoid combination

Mechanism

Rifampicin strongly induces CYP3A4 and P-glycoprotein, increasing quinidine clearance and reducing antiarrhythmic exposu...

Action

Avoid the combination where possible. If rifampicin is essential, involve cardiology, monitor ECG and clinical response,...

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 Quinidine and Rifampicin together?

No — this combination should generally be avoided. Avoid the combination where possible. If rifampicin is essential, involve cardiology, monitor ECG and clinical response, and adjust antiarrhythmic therapy carefully.

What is the severity of this interaction?

The interaction between Quinidine and Rifampicin is classified as Major — avoid combination. Rifampicin strongly induces CYP3A4 and P-glycoprotein, increasing quinidine clearance and reducing antiarrhythmic exposure. Loss of efficacy may precipitate arrhythmia recurrence.

What should I do if I'm prescribed both?

Avoid the combination where possible. If rifampicin is essential, involve cardiology, monitor ECG and clinical response, and adjust antiarrhythmic therapy carefully. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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