Graves’ disease is treated with one of three main approaches: antithyroid medications, radioactive iodine therapy, or surgery to remove the thyroid. The right choice depends on factors like the size of your thyroid, whether you have eye involvement, your age, and whether you’re pregnant or planning to become pregnant. Most people also take a beta-blocker in the early weeks to control symptoms like rapid heart rate and tremors while waiting for the primary treatment to take effect.
Antithyroid Medications
Antithyroid drugs work by blocking the thyroid’s ability to produce excess hormone. Methimazole is the preferred first-line medication for nearly all patients. It’s typically started at 10 to 30 mg daily, then tapered to a lower maintenance dose once thyroid levels normalize. The convenience of once-daily dosing and a better safety profile make it the standard choice over the alternative, propylthiouracil (PTU).
PTU is reserved for specific situations: the first trimester of pregnancy, thyroid storm (a rare, dangerous spike in thyroid hormones), or when someone has had a reaction to methimazole and doesn’t want other treatments. PTU carries a risk of severe liver damage, which is why it’s no longer recommended for children unless other options have failed.
A typical course of antithyroid medication lasts 12 to 18 months. The goal is to bring thyroid levels into the normal range and keep them there long enough for the immune system to calm down on its own. That works for some people, but relapse is common. In a large meta-analysis comparing treatment approaches, about 35% of patients treated with antithyroid drugs relapsed after stopping the medication. A rare but serious side effect is a sudden, dangerous drop in white blood cells, which occurs in roughly 0.1% to 0.5% of patients, usually within the first three months. Symptoms like fever or sore throat during this period need immediate medical attention.
Radioactive Iodine Therapy
Radioactive iodine (RAI) is the most definitive nonsurgical treatment. You swallow a capsule or liquid containing a small amount of radioactive iodine, which concentrates in the thyroid and gradually destroys the overactive tissue. It takes one to three months to start seeing effects, with full results at three to six months.
The success rate is high. In a study of 138 patients, a single dose cured hyperthyroidism in about 88% of cases. The relapse rate after RAI is just 6.3%, far lower than the 35% seen with medications alone. The tradeoff is that most people who receive RAI eventually become hypothyroid, meaning the thyroid produces too little hormone. That’s a permanent condition, but it’s straightforward to manage with a daily thyroid hormone replacement pill.
RAI is not used during pregnancy or breastfeeding, and doctors typically advise waiting at least six months after treatment before conceiving. It’s also generally avoided in patients with moderate to severe thyroid eye disease, since RAI can sometimes worsen eye symptoms.
Surgery
Total thyroidectomy, the complete removal of the thyroid gland, carries a nearly 0% risk of recurrence. It’s the option most likely to resolve Graves’ disease permanently in a single step. Current guidelines from the American Thyroid Association recommend total or near-total thyroidectomy when surgery is chosen.
Surgery tends to be favored when the thyroid is very large or has nodules, when there’s significant eye disease, when medications haven’t worked or caused intolerable side effects, or when someone wants a quick, definitive resolution. In one study of 165 patients who had thyroidectomy for Graves’ disease, the most common reason (38%) was simply patient preference.
The risks are generally low in experienced hands but worth understanding. About 27% of patients in that study experienced temporary low calcium levels after surgery because the parathyroid glands (tiny glands near the thyroid that regulate calcium) can be temporarily stunned. This usually resolves within weeks. Permanent damage to the parathyroid glands occurred in 1.2% of cases. Temporary vocal cord weakness from nerve irritation during surgery happened in 7% of patients, but permanent vocal cord damage was rare at 0.6%. Like RAI, surgery results in permanent hypothyroidism requiring lifelong thyroid hormone replacement.
Beta-Blockers for Early Symptom Relief
Regardless of which primary treatment you choose, beta-blockers are often started right away to ease symptoms while thyroid levels are still elevated. These don’t treat Graves’ disease itself, but they slow the heart rate, reduce tremors, and ease anxiety and heat intolerance. They’re recommended for anyone with a resting heart rate above 90 beats per minute, older adults, and people with existing heart conditions. Propranolol has the added benefit of slightly reducing the conversion of one thyroid hormone into its more active form. Once thyroid levels normalize, beta-blockers are tapered off.
Treating Thyroid Eye Disease
About 25% to 50% of people with Graves’ disease develop some degree of thyroid eye disease, where inflammation causes the tissues behind the eyes to swell, pushing the eyes forward and sometimes affecting vision. This is treated separately from the thyroid itself.
For active, moderate to severe eye disease, intravenous steroids are considered the primary initial therapy to reduce inflammation. A newer option, teprotumumab, was approved by the FDA in 2020 and has shown striking results. In a clinical trial published in the New England Journal of Medicine, 83% of patients treated with teprotumumab had a meaningful reduction in eye bulging, compared to 10% on placebo. On average, eyes receded by about 2.8 mm, a visible and functionally significant improvement. Teprotumumab is given as an intravenous infusion every three weeks over about five months.
Treatment During Pregnancy
Graves’ disease in pregnancy requires careful management because both uncontrolled hyperthyroidism and the medications used to treat it carry risks. Uncontrolled disease raises the chance of miscarriage, preeclampsia, premature delivery, and low birth weight.
The standard approach is to use PTU during the first trimester, since methimazole has been linked to a higher risk of certain birth defects during early fetal development. After the first trimester, many providers switch back to methimazole because of PTU’s liver toxicity risk. Women who know they want to become pregnant are often advised to switch from methimazole to PTU before conceiving. Radioactive iodine is completely off the table during pregnancy and breastfeeding, though surgery in the second trimester is an option when medications aren’t working.
Fetal and neonatal hyperthyroidism occurs in 1% to 5% of women with active or past Graves’ disease, driven by maternal antibodies crossing the placenta. This means close monitoring continues even after the mother’s thyroid levels are well controlled.
Dietary Considerations
The American Thyroid Association suggests that people with hyperthyroidism limit iodine intake to less than 100 micrograms per day, which is about 50 micrograms below the normal adult recommendation. Iodine fuels thyroid hormone production, so excess intake can make hyperthyroidism harder to control and may interfere with treatment.
The biggest sources to watch for are seaweed and kelp products (which can contain thousands of micrograms per serving), iodized salt, dairy, and certain supplements, particularly multivitamins and prenatal vitamins that contain iodine. You don’t need to eliminate iodine entirely, but checking supplement labels and cutting back on concentrated sources makes a meaningful difference in how well your treatment works.