Antifungal agent for topical use, with a wide range of antifungal activity. In small concentrations terbinafine has a fungicidal action against dermatophytes (Trychophyton rubrum, T.mentagrophytes, T.verrucosum, T. violaceum, T.tonsurans, Microsporum canis, Epidermophyton floccosum), moldy C.albicans) and certain dimorphic fungi (Pityrosporum orbiculare). Activity with respect to yeast fungi, depending on their type, may be fungicidal or fungistatic.
Terbinafine specifically changes the early stage of biosynthesis of sterols occurring in fungi. This leads to a deficit of ergosterol and to intracellular accumulation of squalene, which causes death of the fungal cell. The action of terbinafine is carried out by inhibiting the enzyme squalene epoxidase located on the cell membrane of the fungus.
Terbinafine does not affect the cytochrome P450 system in humans and,
respectively, on the metabolism of hormones or other medications.