skip navigationOfficial State of NH Web Site
DOS Logo Homeland Security and Emergency Management Banner
Photo Library | Documents & Forms | Weather | Search

Nuclear Power Plants
About Potassium Iodide

Potassium iodide, with the chemical symbol KI, is a compound which may be used during a nuclear plant emergency to protect against cancer of the thyroid gland caused by exposure to radioactive iodine.

KI is a safe and effective, nonprescription medication. KI blocks the uptake of radioactive iodine by the thyroid gland. KI does not protect a person or the thyroid from direct exposure to radiation that may be released in the event of a radiological emergency. Taking KI will only saturate the thyroid with non-radioactive iodine. Children under fourteen years of age are most at risk from the effects of radioactive iodine on the thyroid gland. To be most effective, KI should be taken before or immediately after exposure to radioactive iodine.

Adverse reactions are possible in persons with existing thyroid conditions and those with an allergy to iodine. Anyone considering the use of KI should consult with their healthcare provider and follow the directions for storage and use included with the product.

The state is currently aware of two companies that supply KI. You may order KI from them either by phone, mail or over the Internet.

Carter-Wallace Laboratories
Thyro-Block Tablets
Order from Internet Web sites:

or by calling 1-800-804-4147
or 1-800-804-4148

Anbex, Inc.
OISAT Tablets
Order from Internet Web site:
or write
Anbex, Inc.
35246 US 19 N. Suite 284
Palm Beach, FL 34684-1931

Remember, evacuation is the most effective protective action.

  New Hampshire Department of Safety | 33 Hazen Drive | Concord, NH 03305
TDD Access: Relay NH 1-800-735-2964
nh | Privacy Policy | Accessibility Policy