FAQ Category: Treatment of Hyperthyroidism in Pregnancy

Yes, both PTU and MMI are considered safe in small to moderate doses during breastfeeding. Monitoring the baby’s thyroid function may be recommended if doses are high.

Thyroid function tests (TSH and Free T4) should be checked every 4–6 weeks during pregnancy, or sooner if symptoms change. This helps adjust medication doses safely.

Beta-blockers like propranolol can help control palpitations and tremors but should only be used short-term. Long-term use may cause fetal growth restriction, so they are not a first-line therapy.

Yes. If untreated, hyperthyroidism increases risks of miscarriage, preterm birth, fetal growth restriction, and stillbirth. With proper treatment and monitoring, these risks are greatly reduced.

The safest treatment is using propylthiouracil (PTU) in the first trimester, then switching to methimazole (MMI) in later trimesters. Radioactive iodine is never safe in pregnancy. Surgery is an option only if medications fail.