rn Please consult your physician before taking any medication. Lamisil 250mg 28 Tabs Generic Name: terbinafine (ter BIH na feen) Brand Names: Lamisil What is terbinafine? Terbinafine is an antifungal medication. It is like an antibiotic but is used to treat fungal infections. Terbinafine is used to treat fungal infections of the fingernails and toenails. Terbinafine may also be used for purposes other than those listed in this medication guide.