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Single-dose pharmacokinetics and metabolism of [(14)C]remofovir was studied in rats and monkeys following intravenous (i.v.) and oral administration (30 mg/kg of body weight). Oral absorption and bioavailability were 29.7 and 5.42% in rats and 65.6 and 19.4% in monkeys, respectively. Following i.v. administration, the elimination half-life for remofovir was 0.7 h in both rats and monkeys. Total body clearance was 5.85 liters/h/kg in rats and 2.60 liters/h/kg in monkeys; apparent volume of distribution was 5.99 liters/kg in rats and 2.70 liters/kg in monkeys. Following oral administration, remofovir was extensively converted to 9-(2-phosphonylmethoxyethyl)adenine (PMEA) and other metabolites in both species. In rats, excretion of total radioactivity in urine accounted for 61.8% of the i.v. dose and 12.9% of the oral dose, while in monkeys it accounted for 43.3% of the i.v. dose and 34.9% of the oral dose. Following i.v. dosing of [(14)C]remofovir, fecal excretion of radioactivity accounted for 37.5% of the dose in rats and 17.4% of the dose in monkeys, indicating significant biliary excretion of the drug in animals. PMEA and metabolite A were the major urinary metabolites in both species after i.v. and oral administration of remofovir.

Single-Dose Pharmacokinetics and Metabolism of [ 14 C]Remofovir in Rats and Cynomolgus Monkeys

Single-Dose Pharmacokinetics and Metabolism of [ ¹⁴ C]Remofovir in Rats and Cynomolgus Monkeys