HICON™ is a kit which provides a solution of Sodium Iodide I-131 with a radioconcentration of 37 gigabecquerels/mL (1,000 millicuries/mL). Each mL of the concentrated solution contains 37 GBq of no-carrier-added Sodium Iodide I-131, < 2 mg of Disodium Edetate Dihydrate USP as a stabilizer, < 4.4 mg of Sodium Thiosulfate Pentahydrate USP as a reducing agent, and < 40 mg of Dibasic Sodium Phosphate Anhydrous USP. The pH of the solution is between 7.5 and 9.0.

Sodium Iodide 131 (Na 131I) for diagnostic use is supplied for oral administration in opaque white gelatin capsules. The capsules are available in a strength of 3.7 megabecquerels (100 microcuries) iodine I-131 at the time of calibration.

Chemical name: (2-mercaptoethyl) trimethylammonium iodide O,O-diethyl phosphorothioate