Summary
Potassium iodide is used to treat certain thyroid conditions and to prevent thyroid damage after a nuclear radiation emergency.
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It can be taken as a supplement, but it is not recommended.
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CVS and Walgreens do not sell potassium iodide drugs in stores, but CVS does sell an over-the-counter variety of the drug on its website.
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Side effects of potassium iodide include nausea, vomiting, and skin rash.
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