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A 17-year-old female asked:

How long until a large dose of potassium iodide leaves the body? what is its half-life?

3 doctor answers3 doctors weighed in
Dr. Susan Rhoads
Family Medicine 39 years experience
Call poison control: The 1/2 life of any drug depends on not just the drug itself, but the person taking it! What other meds do you take? Do you have any chronic medical problems? Did you take this on purpose? Please call poison control now & they will get your history & be give you the best advice If you are in the US call (800) 222-1222 Intn'l: http://apps.who.int/poisoncentres/
Dr.
A Verified Doctoranswered
A US doctor answeredLearn more
It's complicated : As per dr rhoads please contact your poisons centre or an emergency doctor licensed in the us. The iodine can have prolonged effects on the thyroid gland and so needs specific consultation urgently to get advice for your situation.
Dr. Anne Phelan-adams
A Verified Doctoranswered
A US doctor answeredLearn more
It's complicated!: The plasma half-life of a single dose of iodine is fairly short (6-24 hours) but only a fraction of iodine is immediately excreted in urine. The majority is taken up by the thyroid gland and used to synthesize thyroid hormones. The half-life of circulating thyroid hormones is 1-8 days. You can't "untake" a high dose of Iodine but, for future reference, don't take any more than 600 mcg/day.

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