Pharmacokinetics of elbasvir and grazoprevir in subjects with end-stage renal disease or severe renal impairment.

Purpose: To describe the phase 1 and population pharmacokinetic investigations that support dosing recommendations for elbasvir/grazoprevir (EBR/GZR) in hepatitis C virus-infected people with advanced chronic kidney disease. Methods: This was an open-label, two-part, multiple-dose trial (MK-5172 PN050; NCT01937975) in 24 non–HCV-infected participants with end-stage renal disease (ESRD) or severe renal impairment who received once-daily EBR 50 mg and GZR 100 mg for 10 days. Population pharmacokinetic analyses from the phase 3 C-SURFER study (PN052, NCT02092350) were also conducted. Results: When comparing haemodialysis (HD) and non-HD days in participants with ESRD, geometric mean ratios (GMRs) (90% confidence intervals [CIs]) for EBR and GZR AUC0–24 were 1.14 (1.08–1.21) and 0.97 (0.87–1.09). When comparing ESRD and healthy participants, GMRs (90% CIs) for EBR and GZR AUC0–24 were 0.99 (0.75–1.30) and 0.83 (0.56–1.22) on HD days, and 0.86 (0.65–1.14) and 0.85 (0.58–1.25) on non-HD days. GMRs (90% CIs) for AUC0–24 in participants with severe renal impairment relative to healthy controls were 1.65 (1.09–2.49) for GZR and 1.86 (1.38–2.51) for EBR. In population modelling of data from C-SURFER, absolute geometric means of steady-state EBR AUC0–24 were 2.78 and 3.07 μM*h (HD and non-HD recipients) and GZR AUC0–24 were 1.80 and 2.34 μM*h (HD and non-HD recipients). Conclusions: EBR/GZR represents an important treatment option for HCV infection in people with severe renal impairment and those with ESRD. No dosage adjustment of EBR/GZR is required in people with any degree of renal impairment, including those receiving dialysis. [ABSTRACT FROM AUTHOR]