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Levothyroxine and Omeprazole: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Levothyroxine interacts with Omeprazole

Reduced gastric acidity from proton pump inhibition impairs dissolution and absorption of levothyroxine tablets, lowering thyroid hormone exposure.

What you should do

Separate doses by at least 4 hours, or use a liquid or soft-gel levothyroxine formulation; monitor TSH 6–8 weeks after starting or stopping the PPI.

Key facts

Severity

Moderate — caution required

Mechanism

Reduced gastric acidity from proton pump inhibition impairs dissolution and absorption of levothyroxine tablets, lowerin...

Action

Separate doses by at least 4 hours, or use a liquid or soft-gel levothyroxine formulation; monitor TSH 6–8 weeks after s...

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 Omeprazole together?

With caution. Separate doses by at least 4 hours, or use a liquid or soft-gel levothyroxine formulation; monitor TSH 6–8 weeks after starting or stopping the PPI.

What is the severity of this interaction?

The interaction between Levothyroxine and Omeprazole is classified as Moderate — caution required. Reduced gastric acidity from proton pump inhibition impairs dissolution and absorption of levothyroxine tablets, lowering thyroid hormone exposure.

What should I do if I'm prescribed both?

Separate doses by at least 4 hours, or use a liquid or soft-gel levothyroxine formulation; monitor TSH 6–8 weeks after starting or stopping the PPI. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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