Abstract
Reactivation of chronic inactive hepatitis B infection can be spontaneous or triggered by chemotherapy or immunosuppression. Although the pathophysiology behind this remains unclear, several mechanisms have been proposed in the literature. Data describing hepatitis B flares caused by other classes of medications are sparse. We describe a case of reactivation of chronic hepatitis B in a 48-year-old man, who presented with generalized weakness after initiating terbinafine for a fungal toenail infection. He was found to have deranged liver function tests and elevated hepatitis B viral load. Both resolved after discontinuation of terbinafine and starting tenofovir.