- Effect: damages the thyroid cells that make thyroid
hormone. This is the most common permanent treatment of hyperthyroidism in the
- During pregnancy, radioactive iodine may destroy fetal thyroid tissue.
- Breastfeeding women may pass radioactive iodine through breast milk.
- A six month waiting period before pregnancy is suggested after therapy.
- Most patients treated become hypothyroid and require lifelong thyroid
hormone replacement therapy
- Elderly patients and cardiac patients have increased risk of 131I-(radioactive
Stephanie L Lee, MD, PhD, FACE
Sonia Ananthakrishnan, MD
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