Calcium Carbonate and Levothyroxine: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Calcium Carbonate interacts with Levothyroxine

Calcium carbonate chelates levothyroxine in the gut, reducing its absorption and producing inadequate thyroid replacement.

What you should do

Separate doses by at least 4 hours; monitor TSH if combination is necessary.

Key facts

Severity

Moderate — caution required

Mechanism

Calcium carbonate chelates levothyroxine in the gut, reducing its absorption and producing inadequate thyroid replacemen...

Action

Separate doses by at least 4 hours; monitor TSH if combination is necessary.

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 Calcium Carbonate and Levothyroxine together?

With caution. Separate doses by at least 4 hours; monitor TSH if combination is necessary.

What is the severity of this interaction?

The interaction between Calcium Carbonate and Levothyroxine is classified as Moderate — caution required. Calcium carbonate chelates levothyroxine in the gut, reducing its absorption and producing inadequate thyroid replacement.

What should I do if I'm prescribed both?

Separate doses by at least 4 hours; monitor TSH if combination is necessary. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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