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Does Estradiol Interact with Thyroid Hormones?

Estradiol and Thyroid Hormones have a moderate drug interaction according to U.S. FDA drug labeling data. Estradiol increases thyroid-binding globulin, which may increase circulating total thyroid hormone levels. Patients on thyroid replacement therapy may require higher doses. The mechanism involves increased thyroid-binding globulin (tbg) leading to increased circulating total thyroid hormone. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.

Severity: Moderate
Estradiol Class: Estrogen
Management: Monitor for effects
Data Source: U.S. FDA via OpenFDA

How This Interaction Works

The interaction between Estradiol and Thyroid Hormones occurs because increased thyroid-binding globulin (tbg) leading to increased circulating total thyroid hormone. Clinically, this means estradiol increases thyroid-binding globulin, which may increase circulating total thyroid hormone levels. patients on thyroid replacement therapy may require higher doses. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.

What To Tell Your Doctor or Pharmacist

If you are taking Estradiol and your doctor is considering prescribing Thyroid Hormones (or vice versa), make sure to:

Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
Ask whether the benefits of combining these medications outweigh the risks for your specific situation
Ask what symptoms to watch for that would indicate the interaction is causing problems
Ask whether any dosage adjustments are needed
Never stop or change either medication without first consulting your healthcare provider

💊 Estradiol(Climara)+💊 Thyroid Hormones

Severity & Interaction Details

🟡

moderate

Be aware — moderate interaction

Documented interaction with manageable risk. May require dose adjustment or monitoring.

Severity scale

MinorContra

On record

Yes

Drug A class

Estrogen

Drug B class

—

Source

NLP:estradiol

What this means in plain English

Estradiol increases thyroid-binding globulin, which may increase circulating total thyroid hormone levels. Patients on thyroid replacement therapy may require higher doses.

What the FDA label says

"Increased thyroid-binding globulin (TBG) leading to increased circulating total thyroid hormone"

📖 Source: NLP:estradiol

Recent research & FDA safety updates

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Auto-aggregated from PubMed E-utilities and FDA safety data.

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Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine. For informational purposes only. Always consult your pharmacist or physician.