When should potassium iodide tablets be taken? World Health Organization: The most optimal period for administering stable iodine is less than 24 hours before exposure and up to two hours after expected exposure. Taking potassium iodide tablets up to 8 hours after exposure can still be reasonable and effective.

When should potassium iodide tablets be taken? World Health Organization: The most optimal period for administering stable iodine is less than 24 hours before exposure and up to two hours after expected exposure. Taking potassium iodide tablets up to 8 hours after exposure can still be reasonable and effective.