All IOSAT is fully FDA approved for thyroid blocking in a radiation emergency. Please know that IOSAT is the ONLY full-strength potasium iodide tablet approved by th FDA which can be sold in the US. Each standard package of IOSAT contains a strip of 14 tablets, with each tablet containing 130 mg of potasium iodide. The tablets are double scored to split easily and cleanly into 65 and 32.5 child doses.