Terbinafine is widely applied and also is an effective antifungal agent. Although It was rarely found symptomatic hepato-biliary abnormality, but severe hepatitis probably occurred in idiosyncratic individuals. One case was reported, that he took terbinafine 250 mg daily for two weeks. The severe heptatocellular liver injury developed four weeks after the first dose of terbinafine. The mechanism of terbinafine induced liver injury and scales for adverse drug reaction were discussed by literature. (J Intern Med Taiwan 2012; 23: 130-136)