Radioactive Iodine Treatment for Hyperthyroidism | Hormone ...
RAI, also called iodine 131 (I-131), is given as a single-dose capsule or liquid. Most often, you will not need to stay in the hospital. It can take 6 weeks to 6 months to see the full effects of RAI treatment. During this time, your thyroid blood levels will be monitored regularly. You may also need to take antithyroid drugs.
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