Pharmacokinetics, safety, and tolerability of ribavirin in hemodialysis-dependent patients.

Purpose: This study describes the pharmacokinetics, safety, and tolerability of ribavirin in hemodialysis-dependent patients.
Methods: Six adult patients (4 male, 2 female) were recruited from a hemodialysis clinic where they were receiving regular hemodialysis sessions. Patients received a single oral 400-mg dose of ribavirin (2 × 200-mg capsules) after an overnight fast. A 4-h hemodialysis session was performed between 6 and 10 h post-dose. Plasma and urinary concentrations of ribavirin were determined using validated high-performance liquid chromatography/tandem mass spectrometric methods.
Results: Single oral doses of ribavirin 400 mg were safe and well tolerated in this population. Urinary excretion of ribavirin over 48 h was minimal (0.6 mg: approximately 0.14% of the dose). The mean amount removed during the 4-h hemodialysis session (9.6 mg) represented approximately 2.4% of the dose.
Conclusions: Ribavirin hemodialysis clearance (CLhd = 74.5 ml/min) represented approximately 50% of the renal clearance (CLr) measured in subjects with normal renal function (CLr = 129 ml/min).