Levothyroxine and Proton Pump Inhibitor: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Levothyroxine interacts with Proton Pump Inhibitor

PPIs reduce gastric acid secretion, impairing dissolution and absorption of levothyroxine tablets and lowering serum T4/raising TSH.

What you should do

Recheck TSH 6-8 weeks after starting or stopping a PPI in levothyroxine users. Consider liquid or soft-gel levothyroxine formulations, which are less acid-dependent.

Key facts

Severity

Moderate — caution required

Mechanism

PPIs reduce gastric acid secretion, impairing dissolution and absorption of levothyroxine tablets and lowering serum T4/...

Action

Recheck TSH 6-8 weeks after starting or stopping a PPI in levothyroxine users. Consider liquid or soft-gel levothyroxine...

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 Proton Pump Inhibitor together?

With caution. Recheck TSH 6-8 weeks after starting or stopping a PPI in levothyroxine users. Consider liquid or soft-gel levothyroxine formulations, which are less acid-dependent.

What is the severity of this interaction?

The interaction between Levothyroxine and Proton Pump Inhibitor is classified as Moderate — caution required. PPIs reduce gastric acid secretion, impairing dissolution and absorption of levothyroxine tablets and lowering serum T4/raising TSH.

What should I do if I'm prescribed both?

Recheck TSH 6-8 weeks after starting or stopping a PPI in levothyroxine users. Consider liquid or soft-gel levothyroxine formulations, which are less acid-dependent. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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