A member asked:

Why is it necessary to avoid iodine before radioactive iodine 131 therapy for cancer?

A doctor has provided 1 answer

Iodine: Avoidance of iodine a week or so before radioactive iodine treatment will make the treatment more effective as too much iodine in the diet stops thyroid cells from taking up the radioactive iodine.

Answered 7/13/2020

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