It is an object of the present invention to provide an efinaconazole-containing film-forming preparation, which has no sticky surface after solidification thereof, has sufficient cohesiveness after solidification thereof, and is easily peeled without washing. The present invention provides a therapeutic preparation for onychomycosis, comprising efinaconazole or a salt thereof, 1% by weight or more and 30% by weight or less of ethyl cellulose, 20% by weight or more of a volatile solvent (wherein the volatile solvent is water or a liquid component having a boiling point lower than that of water), and 0.01% by weight or more and less than 30% by weight of a surfactant.
