This report describes an adverse reaction to iodinated glycerol, an organic form of iodine prescribed as a mucolytic-expectorant. In a patient with a previous history of severe potassium iodide-induced hypothyroidism, administration of iodinated glycerol resulted in mild subclinical hypothyroidism. There is one report in the literature of goiter resulting from iodinated glycerol and physicians should be aware of the potential for hypothyroidism with this agent. Iodinated glycerol should be added to the list of iodine-containing organic compounds that interfere with thyroid function.
