Should I stop thyroid medicine in pregnancy?

NO. Never stop thyroid medicine during pregnancy. Untreated hypothyroidism can cause miscarriage, preterm birth, and affect baby's brain development.

Is Thyronorm safe during pregnancy?

Yes, Thyronorm (Levothyroxine) is Category A and essential during pregnancy. Your dose may need to be increased.

Generally SafeFDA A

Is Levothyroxine Safe During Pregnancy?

Levothyroxine is ESSENTIAL during pregnancy if you have hypothyroidism. Untreated thyroid can harm baby.

Last reviewed: April 2026

Safety Summary

Levothyroxine is ESSENTIAL during pregnancy if you have hypothyroidism. Untreated thyroid can harm baby.

Category A — Safest

Adequate studies in pregnant women show no risk to the fetus.

Trimester-by-Trimester Guide

1st Trimester (Weeks 1–12)

CRITICAL — continue and never stop. Dose may need 30-50% increase. Check TSH every 4-6 weeks.

2nd Trimester (Weeks 13–26)

Continue. Dose adjustments may be needed.

3rd Trimester (Weeks 27–40)

Continue. Crucial for baby's brain development.

Brands Available in India

ThyronormEltroxinThyrox

Frequently Asked Questions

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Medical Disclaimer: Pregnancy safety information is based on available clinical data and FDA classifications. This page is for educational purposes only and does not substitute professional medical advice. Every pregnancy is different — consult your doctor or gynaecologist before taking any medicine. Drug safety classifications may have been updated; always verify current guidelines.