The pharmaceutical substance Efinaconazole is an antifungal agent that is used for the treatment of fungal infections, particularly those affecting the nails (onychomycosis). It is available in the form of a topical solution or nail lacquer.

Efinaconazole is chemically classified as an imidazole derivative and its chemical name is 2,4-dichloro-N-{(2R,3S)-1-[6-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)pyrimidin-4-yl]azetidin-3-yl}benzamide.

The CAS (Chemical Abstracts Service) number of Efinaconazole is 164650-44-6.