Clinical pharmacokinetics of adefovir in human immunodeficiency virus type 1-infected patients.

Antimicrobial Agents and Chemotherapy
K C CundyH S Jaffe

Abstract

The pharmacokinetics and bioavailability of adefovir [9-[2-(phosphonomethoxy)ethyl]adenine] were examined at two dose levels in three phase I/II studies in 28 human immunodeficiency type 1-infected patients. The concentrations of adefovir in serum following the intravenous infusion of 1.0 or 3.0 mg/kg of body weight were dose proportional and declined biexponentially, with an overall mean +/- standard deviation terminal half-life of 1.6 +/- 0.5 h (n = 28). Approximately 90% of the intravenous dose was recovered unchanged in the urine in 12 h, and more than 98% was recovered by 24 h postdosing. The overall mean +/- standard deviation total serum clearance of the drug (223 +/- 53 ml/h/kg; n = 25) approximated the renal clearance (205 +/- 78 ml/h/kg; n = 20), which was significantly higher (P < 0.01) than the baseline creatinine clearance in the same patients (88 +/- 18 ml/h/kg; n = 25). Since adefovir is essentially completely unbound in plasma or serum, these data indicate that active tubular secretion accounted for approximately 60% of the clearance of adefovir. The steady-state volume of distribution of adefovir (418 +/- 76 ml/kg; n = 28) suggests that the drug was distributed in total body water. Repeated daily dosing with ad...Continue Reading

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