Methadone and Rifampicin: Drug Interaction Guide

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

Interaction severity: Major — avoid combination

How Methadone interacts with Rifampicin

Rifampicin is a potent inducer of CYP3A4 and CYP2B6, accelerating methadone metabolism and precipitating opioid withdrawal within days.

What you should do

Anticipate the need to increase methadone dose by 50–100% during rifampicin therapy and monitor for withdrawal symptoms; taper back after stopping rifampicin.

Key facts

Severity

Major — avoid combination

Mechanism

Rifampicin is a potent inducer of CYP3A4 and CYP2B6, accelerating methadone metabolism and precipitating opioid withdraw...

Action

Anticipate the need to increase methadone dose by 50–100% during rifampicin therapy and monitor for withdrawal symptoms;...

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 Methadone and Rifampicin together?

No — this combination should generally be avoided. Anticipate the need to increase methadone dose by 50–100% during rifampicin therapy and monitor for withdrawal symptoms; taper back after stopping rifampicin.

What is the severity of this interaction?

The interaction between Methadone and Rifampicin is classified as Major — avoid combination. Rifampicin is a potent inducer of CYP3A4 and CYP2B6, accelerating methadone metabolism and precipitating opioid withdrawal within days.

What should I do if I'm prescribed both?

Anticipate the need to increase methadone dose by 50–100% during rifampicin therapy and monitor for withdrawal symptoms; taper back after stopping rifampicin. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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