Article ; Online: Dosing recommendation of nirmatrelvir/ritonavir using an integrated population pharmacokinetic analysis.
CPT: pharmacometrics & systems pharmacology
2023 Volume 12, Issue 12, Page(s) 1897–1910
Abstract: Protease inhibitor nirmatrelvir coadministered with ritonavir as a pharmacokinetic enhancer (PAXLOVID™; Pfizer Inc) became the first orally bioavailable antiviral agent granted Emergency Use Authorization in the United States in patients ≥12 years old ... ...
Abstract | Protease inhibitor nirmatrelvir coadministered with ritonavir as a pharmacokinetic enhancer (PAXLOVID™; Pfizer Inc) became the first orally bioavailable antiviral agent granted Emergency Use Authorization in the United States in patients ≥12 years old with mild to moderate coronavirus disease 2019 (COVID-19). This population pharmacokinetic analysis used pooled plasma nirmatrelvir concentrations from eight completed phase I and II/III studies to characterize nirmatrelvir pharmacokinetics when coadministered with ritonavir in adults with/without COVID-19. Influence of covariates (e.g., formulation, dose, COVID-19) was examined using a stepwise forward selection (α = 0.05) and backward elimination (α = 0.001) approach. Simulations with 5000 subjects for each age and weight group and renal function category were performed to support dosing recommendations of nirmatrelvir/ritonavir for adults with COVID-19 and guide dose adjustments for specific patient populations (e.g., renal insufficiency, pediatrics). The final model was a two-compartment model with first-order absorption, including allometric scaling of body weight and dose-dependent absorption (power function on relative bioavailability). Nirmatrelvir clearance (CL) increased proportionally to body surface area-normalized creatinine CL (nCLCR) up to 70 ml/min/1.73 m |
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MeSH term(s) | Adult ; Humans ; Child ; Ritonavir ; Antiviral Agents ; Benzodiazepines ; COVID-19 |
Chemical Substances | Ritonavir (O3J8G9O825) ; Antiviral Agents ; Benzodiazepines (12794-10-4) |
Language | English |
Publishing date | 2023-10-06 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 2697010-7 |
ISSN | 2163-8306 ; 2163-8306 |
ISSN (online) | 2163-8306 |
ISSN | 2163-8306 |
DOI | 10.1002/psp4.13039 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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