I am having radioactive iodine 131 treatment in two weeks, do you have any tips for me?

Radioactive iodine: Eat low i foods and avoid high i products (kelp, certain vitamins, certain cold/cough remedies). Is this for hyperthryroidism or cancer? If for hyperthyroidism, you need to wait 3-4 days, and then you can resume your (other) treatments, eg methimazole. But discuss this with your doctor. It may take 3-4 months for the rai to ablate the thyroid. Watch for symptoms of hypo.