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KI Pills (Potassium Iodide Tablets)

KI pills are potassium iodide tablets for radiation emergencies. Buy only approved brands.

Updated . Edited by: Ilyass Ben Hakim.

Where to buy

Some pharmacies stock KI over the counter. Some areas near nuclear plants hand out free KI. Ask your local health department first.

Professional insight

Pharmacists check that KI is an approved brand, sealed, and in date. Then they explain it protects only the thyroid.

  • Iosat tablets are 130 mg; ThyroSafe tablets are 65 mg.
  • Blister packs survive storage better than loose bottles.
  • Iodine supplements and kelp are not substitutes.
  • Avoid resellers charging large markups during news scares.

Check the label

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KI pill basics

Active ingredient
Potassium iodide (KI)
US approved brands
Iosat, ThyroSafe, ThyroShield
Protects
Thyroid gland only

KI fills the thyroid with stable iodine. This blocks radioactive iodine uptake. It does not protect other organs or block other radioactive elements.

Safe use

  • Take KI only when public health officials tell you to.
  • Follow the label and official instructions for each age.
  • Taking more or more often adds no protection.
  • Ask a doctor first if you have thyroid or heart disease.
  • Ask a doctor if you have an iodine allergy.

Storage

  • Keep KI in its original blister pack.
  • Store at room temperature, away from damp bathrooms.
  • Keep it with your emergency kit, out of children's reach.
  • Note the expiry date and replace packs when they lapse.

Common questions

Do I need a prescription for KI pills?
No. Approved KI is sold over the counter in the US.
Can I use iodine supplements instead?
No. Supplements and kelp do not give the right dose.
Can I get KI for free?
Often, if you live near a nuclear plant. Ask your health department.
Does KI protect against all radiation?
No. It only blocks radioactive iodine from the thyroid.