You are probably confusing iodine for potassium iodide. Potassium iodide tablets are (somewhat) useful for persons exposed to radiation, a la a Chernobyl type disaster. The U.S. Government is currently buying zillions of potassium iodide tablets in case our friendly neighborhhod terrorists decide to deliver a dirty nuclear bomb anywhere.

Take my word for it, iodine tablets would be about as useful against anthrax as a cinnamon flavored tic-tac. Then again, some of the "anthrax cures" on the Internet probably *are* cinnamon flavored tic-tacs!