Low dose radio-iodine (I-131) treatment is a form of radiation therapy used to treat certain thyroid conditions, such as hyperthyroidism and thyroid cancer as well as commonly used to treat hyperthyroidism, a condition characterized by an overactive thyroid gland.
Radioactive iodine I-131 is a form of iodine that emits radiation. It is administered orally, either as a liquid or capsule. Once ingested, it is quickly absorbed into the bloodstream and concentrated in the thyroid gland. The radioactivity destroys the cells of the thyroid gland, reducing its activity.