Levothyroxine and Rifampicin: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Levothyroxine interacts with Rifampicin

Rifampicin induces hepatic drug-metabolizing enzymes, increasing thyroid hormone clearance. Patients may develop biochemical or symptomatic hypothyroidism.

What you should do

Check TSH after rifampicin initiation and discontinuation. Increase levothyroxine dose temporarily if clinically indicated.

Key facts

Severity

Moderate — caution required

Mechanism

Rifampicin induces hepatic drug-metabolizing enzymes, increasing thyroid hormone clearance. Patients may develop biochem...

Action

Check TSH after rifampicin initiation and discontinuation. Increase levothyroxine dose temporarily if clinically indicat...

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 Levothyroxine and Rifampicin together?

With caution. Check TSH after rifampicin initiation and discontinuation. Increase levothyroxine dose temporarily if clinically indicated.

What is the severity of this interaction?

The interaction between Levothyroxine and Rifampicin is classified as Moderate — caution required. Rifampicin induces hepatic drug-metabolizing enzymes, increasing thyroid hormone clearance. Patients may develop biochemical or symptomatic hypothyroidism.

What should I do if I'm prescribed both?

Check TSH after rifampicin initiation and discontinuation. Increase levothyroxine dose temporarily if clinically indicated. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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