RadBlock - (65mg) Potassium Iodide - 200 tablets (for emergency use only)
Recommended purpose or use: Thyroid blocking agent. for use in nuclear emergencies involving the release of radioiodine. This medication is to be used in addition to measures to avoid exposure to radiation, such as evacuation,shelter,and agriculture and food measures to limit the sale and ingestion of radioiodine contaminated food.
What is potassium iodide?
iodide is a salt, similar to table salt. Its chemical symbol is KI.
It is routinely added to table salt to make it 'iodized'. Potassium
iodide, if taken in time and at the appropriate dosage, blocks the
thyroid gland's uptake of radioactive iodine and thus could reduce the
risk of thyroid cancers and other diseases that might otherwise be
caused by exposure to radioactive iodine that could be dispersed by a
terrorist activity or nuclear accident.
What is the role of potassium iodide in radiological emergency preparedness?
The purpose of radiological emergency preparedness is to protect
people from the effects of radiation exposure after a dirty bomb or
accident at a nuclear power plant. Evacuation is the most effective
protective measure in the event of a radiological emergency because it
protects the whole body (including the thyroid gland and other organs)
from all radionuclides and all exposure pathways. However, in
situations when evacuation is not feasible and in-place sheltering is
substituted as an effective protective action, administering potassium
iodide is a reasonable, prudent, and inexpensive supplement to
evacuation and sheltering.
iodide is a special kind of protective measure in that it offers very
sp ecialized protection. Potassium iodide protects the thyroid gland
against internal uptake of radioiodines that may be released in the
unlikely event of nuclear exposure.
What is the benefit of taking potassium iodide during a radiological accident?
potassium iodide is ingested, it is taken up by the thyroid gland. In
the proper dosage, and taken at the appropriate time, it will
effectively saturate the thyroid gland in such a way that inhaled or
ingested radioactive iodines will not be accumulated in the thyroid
gland. The risk of thyroid effects is reduced. Such thyroid effects
resulting from radioiodine uptakes due to inhalation or ingestion, or
both, could result in acute, chronic, and delayed effects. Acute
effects from high doses include thyroiditis, while chronic and delayed
effects include hypothyroidism, thyroid nodules, and thyroid cancer.
Can individual members of the public obtain potassium iodide?
Canada has approved potassium iodide as an over-the-counter
medication. As with any medication, individuals should check with
their doctor or pharmacist before using it.
What are the recommended dosages of potassium iodide?
In Canada, Health Canada, or in the United States, the FDA, is the
Federal agency responsible for decisions about appropriate thresholds
and dosages for use of potassium iodide:
Threshold Thyroid Radioactive Exposures and
Recommended Doses of KI for Different Risk Groups
||Predicted Thyroid exposure(cGy)
||KI dose (mg)
||# of 130 mg tablets
||# of 65 mg tablets
|Adults over 40 yrs
|Adults over 18 through 40 yrs
|Pregnant or lactating women
|Adoles. over 12 through 18 yrs*
|Children over 3 through 12 yrs
|Over 1 month through 3 years
|Birth through 1 month
The tabled information is provided courtesy of the Nuclear Regulatory Commission.