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RadBlock - (65mg) Potassium Iodide - 200 TABLETS (for emergency use only) - Expiry Date: June 2020


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Product Code: IOD-200

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?

Potassium 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.

Potassium 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?

When 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?

Health 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 >500 130 1 2
Adults over 18 through 40 yrs >10
Pregnant or lactating women > 5
Adoles. over 12 through 18 yrs* 65 1/2 1
Children over 3 through 12 yrs
Over 1 month through 3 years 32 1/4 1/2
Birth through 1 month 16 1/8 1/4

The tabled information is provided courtesy of the Nuclear Regulatory Commission.

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