Morphine and Rifampicin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Morphine interacts with Rifampicin

Rifampicin induces UGT2B7 and CYP3A4, accelerating morphine glucuronidation and reducing analgesic plasma concentrations by up to 75%.

What you should do

Anticipate need for upward dose titration of morphine during rifampicin therapy. Reassess and reduce opioid dose when rifampicin is stopped to avoid toxicity.

Key facts

Severity

Moderate — caution required

Mechanism

Rifampicin induces UGT2B7 and CYP3A4, accelerating morphine glucuronidation and reducing analgesic plasma concentrations...

Action

Anticipate need for upward dose titration of morphine during rifampicin therapy. Reassess and reduce opioid dose when ri...

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 Morphine and Rifampicin together?

With caution. Anticipate need for upward dose titration of morphine during rifampicin therapy. Reassess and reduce opioid dose when rifampicin is stopped to avoid toxicity.

What is the severity of this interaction?

The interaction between Morphine and Rifampicin is classified as Moderate — caution required. Rifampicin induces UGT2B7 and CYP3A4, accelerating morphine glucuronidation and reducing analgesic plasma concentrations by up to 75%.

What should I do if I'm prescribed both?

Anticipate need for upward dose titration of morphine during rifampicin therapy. Reassess and reduce opioid dose when rifampicin is stopped to avoid toxicity. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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