Adults over 40 should not take potassium iodide unless emergency


Adults older than 40 years should not take KI unless public health or emergency management officials say that contamination with a very large dose of radioactive iodine is expected. Adults older than 40 years have the lowest chance of developing thyroid cancer or thyroid injury after contamination with radioactive iodine. They also have a greater chance of having allergic reactions to KI.

Potassium iodide blocks the possibility of thyroid cancer from iodine radiation by filling the thyroid with stable iodine first.

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