Take as directed by a public official if a nuclear emergency should happen.
Take just before or shortly after exposure to radioiodine.

Cautions and warnings: Consult a health-care practitioner prior to use if you are pregnant or breast-feeding; if you have Graves’ disease or autoimmune thyroiditis. Breast-fed infants should receive their dose of iodine by direct administration and should not rely on a protective effect from breast milk. This product is not intended for use as a generic antiradiation drug. It is only effective for specific use during radioiodine exposure. This product is not intended for nutritional use.

Contraindications: Do not take this drug if you are allergic to iodine, have iodine sensitivity, dermatitis herpetiformis, hypocomplementemic vasculitis, or past or present history of hyperthyroidism. Do not take this medicine more often or at higher dose than directed by a health-care practitioner or health-care authority. More potassium iodate/iodide will not help you and may increase the risk of serious side effects.

Known adverse reactions: Serious risks may be associated with the repeated use of this product. Repeated doses should be supervised by a health-care practitioner. Some people may experience sialadenitis (an inflammation of the salivary glands), gastrointestinal disturbances, or temporary rash. Consult a health-care practitioner if symptoms persist or worsen. Contact a health-care practitioner or public health authority immediately in case of an allergic reaction (swelling of arms, face, legs, lips, tongue, or throat; difficulty in breathing, speaking, or swallowing; shortness of breath; appearance of a severe rash; or fever and joint pain).

Keep in a closed container in a dry, cool place, away from light. Do not use if seal is broken. Keep out of reach of children.