Yes, potassium iodide tablets are inherently stable and do not lose their effectiveness over time. Manufacturers must label their products with a shelf-life to ensure that consumers purchase safe and useful products. ... Even in the case of a failure of this sort, the product remains usable.

How long does potassium iodine last?

Like all over-the-counter drugs, potassium iodide pills are labeled with an expiration date, usually five or six years after manufacture. But their components are very stable, according to the Nuclear Regulatory Commission, and it is safe to take them after the expiration date.

Does potassium iodide have a shelf life?

KI is a stable product when stored according to label directions, and with proper storage, FDA officials say, expired lots can be safely used up to six months after the manufacturer's labeled expiration date.