This video provides information on potassium iodide or “KI”. Potassium iodide comes in a pill or a liquid and contains stable, non-radioactive iodine that can help block radioactive iodine from being absorbed by the thyroid gland. KI is available without a prescription, but should only be taken on the advice of public health or emergency management officials. Other videos focused on pharmaceutical countermeasures for radiation emergencies can be found here: http://emergency.cdc.gov/radiation/protectiveactions.asp Comments on this video are allowed in accordance with our comment policy: http://www.cdc.gov/SocialMedia/Tools/CommentPolicy.html This video can also be viewed at http://www.cdc.gov/nceh/radiation/Protective_Actions_Videos/KI/CDC_KI_v4_1080-HI.mp4