Abstract: Embodiments of the presently-disclosed subject matter include compositions that include iodine or salts thereof as well as methods administering the same to subjects in need thereof. In some embodiments the compositions comprise an aqueous solution, a surfactant, a cosurfactant, an oil, and iodine or salts thereof. The composition can be an emulsion. Methods for administration include topical administration, and in some embodiments the compositions can be administered transdermally by applying the composition directly to the skin of a subject. In some embodiments the compositions are topically administered with a spray applicator that dispenses a predetermined amount of the composition upon being actuated.