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Gerhart J, Cox DS, Singh RSP, Chan PLS, Rao R, Allen R, Shi H, Masters JC, Damle B. A Comprehensive Review of the Clinical Pharmacokinetics, Pharmacodynamics, and Drug Interactions of Nirmatrelvir/Ritonavir. Clin Pharmacokinet 2024; 63:27-42. [PMID: 38177893 PMCID: PMC10786959 DOI: 10.1007/s40262-023-01339-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2023] [Indexed: 01/06/2024]
Abstract
Nirmatrelvir is a potent and selective inhibitor of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) main protease that is used as an oral antiviral coronavirus disease 2019 (COVID-19) treatment. To sustain unbound systemic trough concentrations above the antiviral in vitro 90% effective concentration value (EC90), nirmatrelvir is coadministered with 100 mg of ritonavir, a pharmacokinetic enhancer. Ritonavir inhibits nirmatrelvir's cytochrome P450 (CYP) 3A4-mediated metabolism which results in renal elimination becoming the primary route of nirmatrelvir elimination when dosed concomitantly. Nirmatrelvir exhibits absorption-limited nonlinear pharmacokinetics. When coadministered with ritonavir in patients with mild-to-moderate COVID-19, nirmatrelvir reaches a maximum concentration of 3.43 µg/mL (11.7× EC90) in approximately 3 h on day 5 of dosing, with a geometric mean day 5 trough concentration of 1.57 µg/mL (5.4× EC90). Drug interactions with nirmatrelvir/ritonavir (PAXLOVIDTM) are primarily attributed to ritonavir-mediated CYP3A4 inhibition, and to a lesser extent CYP2D6 and P-glycoprotein inhibition. Population pharmacokinetics and quantitative systems pharmacology modeling support twice daily dosing of 300 mg/100 mg nirmatrelvir/ritonavir for 5 days, with a reduced 150 mg/100 mg dose for patients with moderate renal impairment. Rapid clinical development of nirmatrelvir/ritonavir in response to the emerging COVID-19 pandemic was enabled by innovations in clinical pharmacology research, including an adaptive phase 1 trial design allowing direct to pivotal phase 3 development, fluorine nuclear magnetic resonance spectroscopy to delineate absorption, distribution, metabolism, and excretion profiles, and innovative applications of model-informed drug development to accelerate development.
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Affiliation(s)
- Jacqueline Gerhart
- Pfizer Inc, Research and Development, 500 Arcola Road, Collegeville, PA, 19424, USA.
| | - Donna S Cox
- Pfizer Inc, Research and Development, 500 Arcola Road, Collegeville, PA, 19424, USA
| | | | | | - Rohit Rao
- Pfizer Inc, Research and Development, Cambridge, MA, USA
| | - Richard Allen
- Pfizer Inc, Research and Development, Cambridge, MA, USA
| | - Haihong Shi
- Pfizer Inc, Research and Development, Groton, CT, USA
| | | | - Bharat Damle
- Pfizer Inc, Research and Development, New York, NY, USA
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Chan PLS, Singh RSP, Cox DS, Shi H, Damle B, Nicholas T. Dosing recommendation of nirmatrelvir/ritonavir using an integrated population pharmacokinetic analysis. CPT Pharmacometrics Syst Pharmacol 2023; 12:1897-1910. [PMID: 37803876 PMCID: PMC10725264 DOI: 10.1002/psp4.13039] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 08/11/2023] [Indexed: 10/08/2023] Open
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 m2 and was independent of nCLCR above the breakpoint. Significant covariates included carbamazepine or itraconazole coadministration as markers for drug interactions, COVID-19 on CL, formulation on relative bioavailability, and age on central volume of distribution. Simulation results support current dosing recommendations of nirmatrelvir/ritonavir 300/100 mg twice daily (b.i.d.) in adults with normal renal function or mild impairment and pediatrics (12 to <18 years) weighing ≥40 kg and nirmatrelvir/ritonavir 150/100 mg b.i.d. in adults with moderate renal impairment.
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Affiliation(s)
- Phylinda L. S. Chan
- Worldwide Research, Development and MedicalPfizer R&D UK Ltd.Sandwich, KentUK
| | | | - Donna S. Cox
- Worldwide Research, Development and MedicalPfizer Inc.CollegevillePennsylvaniaUSA
| | - Haihong Shi
- Worldwide Research, Development and MedicalPfizer Inc.GrotonConnecticutUSA
| | - Bharat Damle
- Worldwide Research, Development and MedicalPfizer Inc.New YorkNew YorkUSA
| | - Timothy Nicholas
- Worldwide Research, Development and MedicalPfizer Inc.GrotonConnecticutUSA
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Bourdin V, Bigot W, Vanjak A, Burlacu R, Lopes A, Champion K, Depond A, Amador-Borrero B, Sene D, Comarmond C, Mouly S. Drug-Drug Interactions Involving Dexamethasone in Clinical Practice: Myth or Reality? J Clin Med 2023; 12:7120. [PMID: 38002732 PMCID: PMC10672071 DOI: 10.3390/jcm12227120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/04/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
Concomitant administration of multiple drugs frequently causes severe pharmacokinetic or pharmacodynamic drug-drug interactions (DDIs) resulting in the possibility of enhanced toxicity and/or treatment failure. The activity of cytochrome P450 (CYP) 3A4 and P-glycoprotein (P-gp), a drug efflux pump sharing localization and substrate affinities with CYP3A4, is a critical determinant of drug clearance, interindividual variability in drug disposition and clinical efficacy, and appears to be involved in the mechanism of numerous clinically relevant DDIs, including those involving dexamethasone. The recent increase in the use of high doses of dexamethasone during the COVID-19 pandemic have emphasized the need for better knowledge of the clinical significance of drug-drug interactions involving dexamethasone in the clinical setting. We therefore aimed to review the already published evidence for various DDIs involving dexamethasone in vitro in cell culture systems and in vivo in animal models and humans.
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Affiliation(s)
- Venceslas Bourdin
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - William Bigot
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Anthony Vanjak
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Ruxandra Burlacu
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Amanda Lopes
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Karine Champion
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Audrey Depond
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Blanca Amador-Borrero
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
| | - Damien Sene
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
- INSERM U976, Hôpital Saint-Louis, 75010 Paris, France
| | - Chloe Comarmond
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
- INSERM U976, Hôpital Saint-Louis, 75010 Paris, France
| | - Stéphane Mouly
- Internal Medicine Department, Département Médico-Universitaire INVICTUS, Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris (APHP).Nord—Université Paris-Cité, 75010 Paris, France; (V.B.); (W.B.); (A.V.); (R.B.); (A.L.); (K.C.); (A.D.); (B.A.-B.); (D.S.); (C.C.)
- INSERM UMR-S1144, Hôpital Fernand Widal, 75010 Paris, France
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Gerhart J, Draica F, Benigno M, Atkinson J, Reimbaeva M, Francis D, Baillon-Plot N, Sidhu GS, Damle BD. Real-World Evidence of the Top 100 Prescribed Drugs in the USA and Their Potential for Drug Interactions with Nirmatrelvir; Ritonavir. AAPS J 2023; 25:73. [PMID: 37468770 DOI: 10.1208/s12248-023-00832-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 06/07/2023] [Indexed: 07/21/2023] Open
Abstract
Nirmatrelvir (coadministered with ritonavir as PAXLOVIDTM) reduces the risk of COVID-19-related hospitalizations and all-cause death in individuals with mild-to-moderate COVID-19 at high risk of progression to severe disease. Ritonavir is coadministered as a pharmacokinetic enhancer. However, ritonavir may cause drug-drug interactions (DDIs) due to its interactions with various drug-metabolizing enzymes and transporters, including cytochrome P450 (CYP) 3A, CYP2D6, and P-glycoprotein transporters. To better understand the extent of DDIs (or lack thereof) of nirmatrelvir; ritonavir in a clinical setting, this study used real-world evidence (RWE) from the Optum Clinformatics Data Mart database to identify the top 100 drugs most commonly prescribed to US patients at high risk of progression to severe COVID-19 disease. The top 100 drugs were identified based on total counts associated with drugs prescribed to high-risk patients (i.e., ≥ 1 medical condition associated with an increased risk of severe COVID-19) who were continuously enrolled in the database throughout 2019 and had ≥ 1 prescription claim. Each of the 100 drugs was then assessed for DDI risk based on their metabolism, excretion, and transport pathways identified from available US prescribing and medical literature sources. Seventy drugs identified were not expected to have DDIs with nirmatrelvir; ritonavir, including many cardiovascular agents, anti-infectives, antidiabetic agents, and antidepressants. Conversely, 30 drugs, including corticosteroids, narcotic analgesics, anticoagulants, statins, and sedatives/hypnotics, were expected to cause DDIs with nirmatrelvir; ritonavir. This RWE analysis is complementary to the prescribing information and other DDI management tools for guiding healthcare providers in managing DDIs.
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Affiliation(s)
- Jacqueline Gerhart
- Pfizer Inc, Global Product Development, 500 Arcola Road, Collegeville, Pennsylvania, 19426, USA.
| | - Florin Draica
- Pfizer Inc, US Medical Affairs, Hospital, New York, New York, USA
| | | | | | - Maya Reimbaeva
- Pfizer Inc, Global Biometrics and Data Management, Groton, Connecticut, USA
| | - Domenick Francis
- Pfizer Inc, US Medical Affairs, Hospital, New York, New York, USA
| | | | | | - Bharat D Damle
- Pfizer Inc, Global Product Development, New York, New York, USA
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