Levothyroxine and Orlistat: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Levothyroxine interacts with Orlistat

Orlistat may reduce gastrointestinal absorption of levothyroxine, likely through binding or altered fat-related absorption conditions. This can reduce thyroid hormone exposure.

What you should do

Separate administration and monitor TSH. Adjust levothyroxine dose if biochemical or clinical hypothyroidism develops.

Key facts

Severity

Moderate — caution required

Mechanism

Orlistat may reduce gastrointestinal absorption of levothyroxine, likely through binding or altered fat-related absorpti...

Action

Separate administration and monitor TSH. Adjust levothyroxine dose if biochemical or clinical hypothyroidism develops.

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 Orlistat together?

With caution. Separate administration and monitor TSH. Adjust levothyroxine dose if biochemical or clinical hypothyroidism develops.

What is the severity of this interaction?

The interaction between Levothyroxine and Orlistat is classified as Moderate — caution required. Orlistat may reduce gastrointestinal absorption of levothyroxine, likely through binding or altered fat-related absorption conditions. This can reduce thyroid hormone exposure.

What should I do if I'm prescribed both?

Separate administration and monitor TSH. Adjust levothyroxine dose if biochemical or clinical hypothyroidism develops. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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