The present invention relates to a non-coating external treatment for onychomycosis comprising a medium-chain fatty acid triglyceride as a non-volatile component. provide. In particular, the present invention provides an external treatment for onychomycosis comprising an antifungal active substance such as efinaconazole, a volatile component, an additive such as a medium chain fatty acid triglyceride, and a permeation enhancer such as ethyl lactate. This preparation has significantly improved nail permeability, and has excellent properties as a pharmaceutical from the viewpoint of medicinal properties and physical properties of the preparation.
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