Iron Salts and Levothyroxine: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Iron Salts interacts with Levothyroxine

Iron salts chelate levothyroxine in the gut, reducing oral absorption. This may cause subtherapeutic thyroid hormone levels.

What you should do

Separate doses by at least 4 hours and recheck TSH after changes in iron therapy.

Key facts

Severity

Moderate — caution required

Mechanism

Iron salts chelate levothyroxine in the gut, reducing oral absorption. This may cause subtherapeutic thyroid hormone lev...

Action

Separate doses by at least 4 hours and recheck TSH after changes in iron therapy.

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 Iron Salts and Levothyroxine together?

With caution. Separate doses by at least 4 hours and recheck TSH after changes in iron therapy.

What is the severity of this interaction?

The interaction between Iron Salts and Levothyroxine is classified as Moderate — caution required. Iron salts chelate levothyroxine in the gut, reducing oral absorption. This may cause subtherapeutic thyroid hormone levels.

What should I do if I'm prescribed both?

Separate doses by at least 4 hours and recheck TSH after changes in iron therapy. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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