Levothyroxine and Oral Calcium: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Levothyroxine interacts with Oral Calcium

Calcium salts chelate or adsorb levothyroxine in the gut, reducing levothyroxine absorption. This may cause loss of thyroid hormone control.

What you should do

Separate doses by at least 4 hours and recheck thyroid function if calcium therapy is added or changed.

Key facts

Severity

Moderate — caution required

Mechanism

Calcium salts chelate or adsorb levothyroxine in the gut, reducing levothyroxine absorption. This may cause loss of thyr...

Action

Separate doses by at least 4 hours and recheck thyroid function if calcium therapy is added or changed.

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 Oral Calcium together?

With caution. Separate doses by at least 4 hours and recheck thyroid function if calcium therapy is added or changed.

What is the severity of this interaction?

The interaction between Levothyroxine and Oral Calcium is classified as Moderate — caution required. Calcium salts chelate or adsorb levothyroxine in the gut, reducing levothyroxine absorption. This may cause loss of thyroid hormone control.

What should I do if I'm prescribed both?

Separate doses by at least 4 hours and recheck thyroid function if calcium therapy is added or changed. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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