Pharmacokinetics, bioavailability, metabolism, and tissue distribution of cidofovir (HPMPC) and cyclic HPMPC in rats.

The pharmacokinetics, distribution, and metabolism of [14C]cidofovir and its cyclic analog {[2-14C]-1-[((S)-2-hydroxy-2-oxo-1,4, 2-dioxaphosphorinan-5-yl)methyl]cytosine; [14C]cyclic HPMPC} were compared after administration to Sprague-Dawley rats. After intravenous (iv) administration of [14C]cidofovir (3 or 5 mg/kg) or [14C]cyclic HPMPC (5 mg/kg), plasma concentrations of total radioactivity declined in a multiexponential manner for both drugs...