NCIt definition : An orally available nucleotide prodrug and a hepatitis C virus (HCV) NS5B polymerase
inhibitor with potential HCV inhibiting activity. Upon oral administration, sofosbuvir
is metabolized to 2'-deoxy-2'-alpha-fluoro-beta-C-methyluridine-5'-monophosphate,
which is then converted into the active triphosphate nucleotide that inhibits the
NS5B polymerase, thereby preventing viral replication. The HCV NS5B protein, an RNA-dependent
RNA polymerase, is essential for the replication of the viral HCV RNA genome.;