Hypophosphatemia Due to Adefovir Treatment

Abstract

Adefovir dipivoxil is an orally effective prodrug excreted unchanged in urine by glomerular filtration and tubular secretion. While it effectively suppresses hepatitis B virus replication, it may cause nephrotoxicity characterized by severe hypophosphatemia. In this report, we present a case of isolated hypophosphatemia due to long-term use of adefovir dipivoxil (10 mg/day). Due to the risk of hypophosphatemia with extended use, calcium and serum levels and symptoms suggesting nephrotoxicity should be followed in patients using adefovir dipivoxil for an extended period.