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Olney KB, Howard JI, Burgess DS. Daptomycin Dose Optimization in Pediatric Staphylococcus aureus Bacteremia: A Pharmacokinetic/Pharmacodynamic Investigation. J Clin Pharmacol 2024; 64:860-865. [PMID: 38497326 DOI: 10.1002/jcph.2425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 02/15/2024] [Indexed: 03/19/2024]
Abstract
Daptomycin is an antibiotic with Gram-positive activity, including methicillin-resistant Staphylococcus aureus, for which optimal pediatric dosing is unknown. This study aimed to evaluate daptomycin exposures achieved with package label dosing and to identify dosing regimens necessary to enhance efficacy and minimize toxicity in children with S. aureus bacteremia. Monte Carlo simulations were performed to determine probability of target attainment (PTA) for six pediatric age cohorts. Area under the curve to minimum inhibitory concentration ratio (AUC0-24:MIC) ≥666 was used to determine the PTA for efficacy (PTAE). Minimum concentration (Cmin) ≥24.3 mg/L determined the PTA for toxicity (PTAT). Acceptable dosing regimens were those which achieved the combined target of ≥90% PTAE and ≤5% PTAT. Package label dosing of daptomycin yielded insufficient efficacy with only 26.3% PTAE in children 13-24 months, 39.5% PTAE in children 2-6 years, 30.1% PTAE in children 7-11 years, and 50.1% PTAE in adolescents ≥12 years. To achieve the combined efficacy and safety target, doses of 18-24 mg/kg in children 3-12 months, 20-24 mg/kg in children 13-24 months, 19-24 mg/kg in children 2-6 years, 17-19 mg/kg in children 7-11 years, and 10-14 mg/kg in adolescents ≥12 years are necessary. Package label dosing resulted in suboptimal exposure for the majority of pediatric patients in all age groups evaluated. If targeting validated efficacy and safety endpoints, daily daptomycin doses of at least 20 mg/kg in children ≤6 years, 17 mg/kg in children 7-11 years, and 10 mg/kg in adolescents ≥12 years are necessary. Clinical studies evaluating these higher doses are needed.
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Affiliation(s)
- Katie B Olney
- Department of Pharmacy Services, University of Kentucky HealthCare, Lexington, KY, USA
- Department of Pharmacy Practice and Science, University of Kentucky College of Pharmacy, Lexington, KY, USA
| | - Joel I Howard
- Department of Pediatrics: Division of Infectious Diseases, University of Kentucky HealthCare, Lexington, KY, USA
- Department of Pediatrics, University of Kentucky College of Medicine, Lexington, KY, USA
| | - David S Burgess
- Department of Pharmacy Practice and Science, University of Kentucky College of Pharmacy, Lexington, KY, USA
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Chang J, Tasellari A, Wagner JL, Scheetz MH. Contemporary pharmacologic treatments of MRSA for hospitalized adults: rationale for vancomycin versus non-vancomycin therapies as first line agents. Expert Rev Anti Infect Ther 2023; 21:1309-1325. [PMID: 37876291 DOI: 10.1080/14787210.2023.2275663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/23/2023] [Indexed: 10/26/2023]
Abstract
INTRODUCTION Methicillin-resistant Staphylococcus aureus (MRSA) remains an important pathogen in the hospital setting and causes significant morbidity and mortality each year. Since the initial discovery over 60 years ago, vancomycin has remained a first-line treatment for many different types of MRSA infections. However, significant concerns related to target attainment and nephrotoxicity have spurred efforts to develop more effective agents in the last two decades. AREAS COVERED Newer anti-MRSA antibiotics that have been approved since 2000 include linezolid, daptomycin, and ceftaroline. As clinical evidence has accumulated, these newer agents have become more frequently used, and some are now recommended as co-first-line options (along with vancomycin) in clinical practice guidelines. For this review, a scoping review of the literature was conducted to support our findings and recommendations. EXPERT OPINION Vancomycin remains an important standard of care for MRSA infections but is limited with respect to nephrotoxicity and rapid target attainment. Newer agents such as linezolid, daptomycin, and ceftaroline have specific indications for treating different types of MRSA infections; however, newer agents also have unique attributes which require consideration during therapy.
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Affiliation(s)
- Jack Chang
- Department of Pharmacy Practice, Midwestern University College of Pharmacy, Downers Grove, IL, USA
- Pharmacometrics Center of Excellence, Midwestern University College of Pharmacy, Downers Grove, IL, USA
- Northwestern Memorial Hospital, Department of Pharmacy, Chicago, IL, USA
| | - Ardita Tasellari
- Department of Pharmacy Practice, Midwestern University College of Pharmacy, Downers Grove, IL, USA
| | - Jamie L Wagner
- School of Pharmacy, University of Mississippi, Jackson, MS, USA
| | - Marc H Scheetz
- Department of Pharmacy Practice, Midwestern University College of Pharmacy, Downers Grove, IL, USA
- Pharmacometrics Center of Excellence, Midwestern University College of Pharmacy, Downers Grove, IL, USA
- Northwestern Memorial Hospital, Department of Pharmacy, Chicago, IL, USA
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Oda K, Saito H, Jono H. Bayesian prediction-based individualized dosing of anti-methicillin-resistant Staphylococcus aureus treatment: Recent advancements and prospects in therapeutic drug monitoring. Pharmacol Ther 2023; 246:108433. [PMID: 37149156 DOI: 10.1016/j.pharmthera.2023.108433] [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: 12/26/2022] [Revised: 04/19/2023] [Accepted: 05/02/2023] [Indexed: 05/08/2023]
Abstract
As one of the efficient techniques for TDM, the population pharmacokinetic (popPK) model approach for dose individualization has been developed due to the rapidly growing innovative progress in computer technology and has recently been considered as a part of model-informed precision dosing (MIPD). Initial dose individualization and measurement followed by maximum a posteriori (MAP)-Bayesian prediction using a popPK model are the most classical and widely used approach among a class of MIPD strategies. MAP-Bayesian prediction offers the possibility of dose optimization based on measurement even before reaching a pharmacokinetically steady state, such as in an emergency, especially for infectious diseases requiring urgent antimicrobial treatment. As the pharmacokinetic processes in critically ill patients are affected and highly variable due to pathophysiological disturbances, the advantages offered by the popPK model approach make it highly recommended and required for effective and appropriate antimicrobial treatment. In this review, we focus on novel insights and beneficial aspects of the popPK model approach, especially in the treatment of infectious diseases with anti-methicillin-resistant Staphylococcus aureus agents represented by vancomycin, and discuss the recent advancements and prospects in TDM practice.
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Affiliation(s)
- Kazutaka Oda
- Department of Pharmacy, Kumamoto University Hospital, 1-1-1 Honjo, Chuo-ku, Kumamoto, Japan
| | - Hideyuki Saito
- Department of Pharmacy, Kumamoto University Hospital, 1-1-1 Honjo, Chuo-ku, Kumamoto, Japan; Department of Clinical Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, Kumamoto University; 1-1-1, Honjo, Chuo-ku, Kumamoto, Japan
| | - Hirofumi Jono
- Department of Pharmacy, Kumamoto University Hospital, 1-1-1 Honjo, Chuo-ku, Kumamoto, Japan; Department of Clinical Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, Kumamoto University; 1-1-1, Honjo, Chuo-ku, Kumamoto, Japan.
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Takahashi S, Tsuji Y, Holford N, Ogami C, Kasai H, Kawasuji H, To H, Yamamoto Y. Population Pharmacokinetic Model for Unbound Concentrations of Daptomycin in Patients with MRSA Including Patients Undergoing Hemodialysis. Eur J Drug Metab Pharmacokinet 2023; 48:201-211. [PMID: 36862367 DOI: 10.1007/s13318-023-00820-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/12/2023] [Indexed: 03/03/2023]
Abstract
BACKGROUND AND OBJECTIVE Unbound daptomycin concentrations are responsible for pharmacologically beneficial and adverse effects, although most previous reports have been limited to the use of total concentrations. We developed a population pharmacokinetic model to predict both total and unbound daptomycin concentrations. METHODS Clinical data were collected from 58 patients with methicillin-resistant Staphylococcus aureus including patients undergoing hemodialysis. A total of 339 serum total and 329 unbound daptomycin concentrations were used for model construction. RESULTS Total and unbound daptomycin concentration was explained by a model that assumed first-order distribution with two compartments, and first-order elimination. Normal fat body mass was identified as covariates. Renal function was incorporated as a linear function of renal clearance and independent non-renal clearance. The unbound fraction was estimated to be 0.066 with a standard albumin of 45 g/L and standard creatinine clearance of 100 mL/min. Simulated unbound daptomycin concentration was compared with minimum inhibitory concentration as a measure of clinical effectiveness and exposure-level-related induction of creatine phosphokinase elevation. The recommended doses were 4 mg/kg for patients with severe renal function [creatinine clearance (CLcr) ≤ 30 mL/min] and 6 mg/kg for patients with mild to moderate renal function (CLcr > 30 and ≤ 60 mL/min). A simulation indicated that dose adjusted by body weight and renal function improved target attainment. CONCLUSIONS This population pharmacokinetics model for unbound daptomycin could help clinicians to select the appropriate dose regimen for patients undergoing daptomycin treatment and reduce associated adverse effects.
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Affiliation(s)
- Saki Takahashi
- Department of Medical Pharmaceutics, Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Yasuhiro Tsuji
- Laboratory of Clinical Pharmacometrics, School of Pharmacy, Nihon University, 7-7-1 Narashinodai, Funabashi, Chiba, 274-8555, Japan.
| | - Nick Holford
- Department of Pharmacology and Clinical Pharmacology, University of Auckland, Auckland, New Zealand
| | - Chika Ogami
- Department of Medical Pharmaceutics, Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Hidefumi Kasai
- Department of Clinical Pharmacokinetics and Pharmacodynamics, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Hitoshi Kawasuji
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Hideto To
- Department of Medical Pharmaceutics, Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Yoshihiro Yamamoto
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, 2630 Sugitani, Toyama, 930-0194, Japan
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Lodise TP, O’Donnell JN, Balevic S, Liu X, Gu K, George J, Raja S, Guptill JT, Zaharoff S, Schwager N, Fowler VG, Wall A, Wiegand K, Chambers HF. Pharmacokinetics of Ceftazidime-Avibactam in Combination with Aztreonam (COMBINE) in a Phase 1, Open-Label Study of Healthy Adults. Antimicrob Agents Chemother 2022; 66:e0093622. [PMID: 36394326 PMCID: PMC9764983 DOI: 10.1128/aac.00936-22] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 10/19/2022] [Indexed: 11/19/2022] Open
Abstract
Scant pharmacokinetic (PK) data are available on ceftazidime-avibactam (CZA) and aztreonam (ATM) in combination, and it is unknown if CZA-ATM exacerbates alanine aminotransferase (ALT)/aspartate aminotransferase (AST) elevations relative to ATM alone. This phase 1 study sought to describe the PK of CZA-ATM and assess the associations between ATM exposures and ALT/AST elevations. Subjects (n = 48) were assigned to one of six cohorts (intermittent infusion [II] CZA, continuous infusion [CI] CZA, II ATM, CI ATM [8 g/daily], II CZA with II ATM [6 g/daily], and II CZA with II ATM [8 g/daily]), and study product(s) were administered for 7 days. A total of 19 subjects (40%) had ALT/AST elevations, and most (89%) occurred in the ATM/CZA-ATM cohorts. Two subjects in the CI ATM cohort experienced severe ALT/AST elevations, which halted the study. All subjects with ALT/AST elevations were asymptomatic with no other signs of liver injury, and all ALT/AST elevations resolved without sequalae after cessation of dosing. In the population PK (PopPK) analyses, CZA-ATM administration reduced total ATM clearance by 16%, had a negligible effect on total ceftazidime clearance, and was not a covariate in the avibactam PopPK model. In the exposure-response analyses, coadministration of CZA-ATM was not found to augment ALT/AST elevations. Modest associations were observed between ATM exposure (maximum concentration of drug in serum [Cmax] and area under the concentration-time curve [AUC]) and ALT/AST elevations in the analysis of subjects in the II ATM/CZA-ATM cohorts. The findings suggest that administration of CZA-ATM reduces ATM clearance but does not exacerbate AST/ALT elevations relative to ATM alone. The results also indicate that CI ATM should be used with caution.
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Affiliation(s)
- Thomas P. Lodise
- Albany College of Pharmacy and Health Sciences, Albany, New York, USA
| | | | - Stephen Balevic
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Xing Liu
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Kenan Gu
- Office of Regulatory Affairs (ORA), Division of Microbiology and Infectious Diseases (DMID), National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Jomy George
- Office of Regulatory Affairs (ORA), Division of Microbiology and Infectious Diseases (DMID), National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Shruti Raja
- Duke Early Phase Clinical Research Unit, Duke University School of Medicine, Durham, North Carolina, USA
| | - Jeffrey T. Guptill
- Duke Early Phase Clinical Research Unit, Duke University School of Medicine, Durham, North Carolina, USA
| | - Smitha Zaharoff
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Nyssa Schwager
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | - Vance G. Fowler
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
| | | | | | - Henry F. Chambers
- University of California, San Francisco, and San Francisco General Hospital, San Francisco, California, USA
| | - Antibacterial Resistance Leadership Group
- Albany College of Pharmacy and Health Sciences, Albany, New York, USA
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Office of Regulatory Affairs (ORA), Division of Microbiology and Infectious Diseases (DMID), National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, Maryland, USA
- Duke Early Phase Clinical Research Unit, Duke University School of Medicine, Durham, North Carolina, USA
- The Emmes Company, Rockville, Maryland, USA
- University of California, San Francisco, and San Francisco General Hospital, San Francisco, California, USA
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Rose W, Volk C, Dilworth TJ, Sakoulas G. Approaching 65 Years: Is it Time to Consider Retirement of Vancomycin for Treating Methicillin-Resistant Staphylococcus aureus Endovascular Infections? Open Forum Infect Dis 2022; 9:ofac137. [PMID: 35493116 PMCID: PMC9043000 DOI: 10.1093/ofid/ofac137] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 03/17/2022] [Indexed: 11/21/2022] Open
Abstract
Vancomycin was introduced nearly 65 years ago and remains the standard antibiotic for serious methicillin-resistant Staphylococcus aureus (MRSA) infections. Staphylococcus aureus remains highly susceptibility to vancomycin (>97%). Despite this, MRSA treatment failure with vancomycin is high in complicated bacteremia. Additionally, vancomycin can cause nephrotoxicity, leading to new therapeutic drug monitoring guidance. This demonstrates how difficult it is to dose vancomycin in a way that is both efficacious and safe, especially during long courses of therapy. Often underappreciated are the cost, resources, and complexity of vancomycin care at a time when alternative antibiotics are becoming cost comparable. This perspective highlights a bigger picture of how the treatment repertoires of many other diseases have changed and advanced since vancomycin’s introduction in the 1950s, yet the vancomycin MRSA treatment standard remains. While vancomycin can still have a role, 65 years may be a practical retirement age for vancomycin in highly complex endovascular infections.
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Affiliation(s)
- Warren Rose
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, USA
| | - Cecilia Volk
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, USA
| | - Thomas J Dilworth
- Department of Pharmacy Services, Advocate Aurora Health, Milwaukee, WI, USA
| | - George Sakoulas
- Division of Host-Microbe Systems & Therapeutics, Center for Immunity, Infection & Inflammation, University of California-San Diego School of Medicine, La Jolla, CA, USA
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Efficacy and Safety of Daptomycin versus Vancomycin for Bacteremia Caused by Methicillin-Resistant Staphylococcus aureus with Vancomycin Minimum Inhibitory Concentration > 1 µg/mL: A Systematic Review and Meta-Analysis. Pharmaceutics 2022; 14:pharmaceutics14040714. [PMID: 35456548 PMCID: PMC9032134 DOI: 10.3390/pharmaceutics14040714] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 03/16/2022] [Accepted: 03/23/2022] [Indexed: 02/01/2023] Open
Abstract
This systematic review and meta-analysis compares the efficacy of daptomycin and vancomycin in adult patients with bacteremia by methicillin-resistant Staphylococcus aureus (MRSA) with vancomycin minimum inhibitory concentration (MIC) > 1 µg/mL. We searched the PubMed, Web of Science, Cochrane Library, and ClinicalTrials.gov databases on 12 May 2020. All-cause mortality (primary outcome) and treatment success rates were compared and subgroups stratified by infection source risk level and method of vancomycin susceptibility testing were also analyzed. Seven studies (n = 907 patients) were included in this efficacy analysis. Compared with vancomycin, daptomycin treatment was associated with significantly lower mortality (six studies, odds ratio (OR) 0.53, 95% confidence interval (CI) 0.29−0.98) and higher treatment success (six studies, OR 2.20, 95% CI 1.63−2.96), which was consistent regardless of the vancomycin MIC test method used. For intermediate-risk sources, daptomycin was a factor increasing treatment success compared with vancomycin (OR 4.40, 95% CI 2.06−9.40), and it exhibited a trend toward a higher treatment success rate for high-risk sources. In conclusion, daptomycin should be considered for the treatment of bacteremia caused by MRSA with vancomycin MIC > 1 µg/mL, especially in patients with intermediate- and high-risk bacteremia sources.
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Menezes B, Alves I, Staudt K, Beltrame B, Michelin L, de Araújo BV, Tasso L. PK/PD modeling of daptomycin against MRSA and MRSE and Monte Carlo simulation for bacteremia treatment. Braz J Microbiol 2021; 52:1967-1979. [PMID: 34337679 DOI: 10.1007/s42770-021-00582-4] [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: 12/22/2020] [Accepted: 07/11/2021] [Indexed: 10/20/2022] Open
Abstract
OBJECTIVES The aim of this study was to investigate the effect of daptomycin against methicillin-resistant staphylococci (MRSA and MRSE) bacteremia using computer modeling. METHODS A pharmacokinetic/pharmacodynamic (PK/PD) modeling strategy to explain the data from an in vitro dynamic model employing time-kill curves for MRSA and MRSE was proposed. Bacterial killing was followed over time by determining viable counts and the resulting time-kill data was analyzed. Monte Carlo simulations were performed using pharmacokinetic parameters and pharmacodynamic data to determine the probabilities of target attainment and cumulative fractions of response in terms of area under the concentration curve/minimum inhibition concentration (MIC) targets of daptomycin. Simulations were conducted to assess the reduction in the number of colony-forming units (CFU)/mL for 18 days of treatment with daptomycin at doses of 6, 8, and 10 mg/kg/24 h or 48 h with variations in creatinine clearance (CLCR): 15-29 mL/min/1.73 m2, 30-49 mL/min/1.73 m2, 50-100 mL/min/1.73 m2, as well as for defining the probability of reaching the target fAUC/MIC = 80 in the same dose and clearance range. A PK/PD model with saturation in the number of bacteria in vitro, growth delay, and bacterial death, as well as Hill's factor, was used to describe the data for both MRSA and MRSE. RESULTS Monte Carlo simulations showed that for MRSA there was a reduction > 2 log CFU/mL with doses ≥ 6 mg/kg/day in 75th percentile of the simulated population after 18 days of treatment with daptomycin, whereas for MRSE this reduction was observed in 95th percentile of the population. CONCLUSIONS The presented in vitro PK/PD model and associated modeling approach were able to characterize the time-kill kinetics of MRSA and MRSE. Our study based on PTAs suggests that doses ≥ 6 mg/kg/day of daptomycin should be used to treat bacteremia caused by MRSA and MRSE in patients with CLCR of 15-29 mL/min/1.73 m2. For patients with CLCR ≥ 50 mL/min/1.73 m2, it would be necessary to employ a dose of 10 mg/kg/day to treat complicated bacteremias.
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Affiliation(s)
- Bruna Menezes
- Programa de Pós-Graduação Em Biotecnologia, Universidade de Caxias Do Sul, Caxias do Sul, Brazil
| | - Izabel Alves
- Programa de Pós-Graduação Em Ciências Farmacêuticas, Universidade Federal Do Rio Grande Do Sul, Porto Alegre, Brazil
| | - Keli Staudt
- Programa de Pós-Graduação Em Ciências Farmacêuticas, Universidade Federal Do Rio Grande Do Sul, Porto Alegre, Brazil
| | - Betina Beltrame
- Curso de Farmácia, Universidade de Caxias Do Sul, Caxias do Sul, Brazil
| | - Lessandra Michelin
- Programa de Pós-Graduação Em Ciências da Saúde, Universidade de Caxias Do Sul, Rua Francisco Getúlio Vargas, Caxias do Sul, 1130, 95070-560, Brazil
| | - Bibiana Verlindo de Araújo
- Programa de Pós-Graduação Em Ciências Farmacêuticas, Universidade Federal Do Rio Grande Do Sul, Porto Alegre, Brazil
| | - Leandro Tasso
- Programa de Pós-Graduação Em Biotecnologia, Universidade de Caxias Do Sul, Caxias do Sul, Brazil. .,Programa de Pós-Graduação Em Ciências da Saúde, Universidade de Caxias Do Sul, Rua Francisco Getúlio Vargas, Caxias do Sul, 1130, 95070-560, Brazil.
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Population Pharmacokinetic Analysis and Dosing Optimization Based on Unbound Daptomycin Concentration and Cystatin C in Nonobese Elderly Patients with Hypoalbuminemia and Chronic Kidney Disease. Pharm Res 2021; 38:1041-1055. [PMID: 34013390 DOI: 10.1007/s11095-021-03058-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 05/10/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE This study evaluated the population pharmacokinetics of daptomycin in nonobese elderly patients with hypoalbuminemia and chronic kidney disease (CKD) using the glomerular filtration rate estimated from cystatin C (eGFRcys) and estimated its optimal dose. METHODS We performed population pharmacokinetic analysis of the unbound concentrations of daptomycin. The probability of target attainment of 90% for achieving an area under the concentration-time curve of unbound daptomycin at steady state/ minimum inhibitory concentration ratio of ≥66.6 was stochastically simulated. RESULTS In the population pharmacokinetic analysis of 25 patients aged ≥65 years, the two-compartment model using eGFRcys and age as covariates of clearance in central compartment of unbound daptomycin were optimal. The unbound fraction rate (fu) was 0.05-0.14. According to the Monte Carlo simulation, the optimal doses for patients with eGFRcys of 20-60 mL/min and aged 65-95 years were calculated as 200-500 mg q24h. CONCLUSION These results suggest that establishing the dose using total concentrations may result in under- or overestimation caused by alterations in fu. The optimal dose for nonobese elderly patients with hypoalbuminemia and CKD depends on eGFRcys and age, and a standard dose may be insufficient for some patients.
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Real-Time Therapeutic Drug Monitoring-Based Pharmacokinetic/Pharmacodynamic Optimization of Complex Antimicrobial Therapy in a Critically Ill Morbidly Obese Patient. Grand Round/A Case Study. Ther Drug Monit 2021; 42:349-352. [PMID: 32039939 DOI: 10.1097/ftd.0000000000000740] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The authors present the case of a critically ill morbidly obese patient (body mass index, 51.2 kg/m) who suffered from methicillin-resistant Staphylococcus epidermidis, and Candida albicans bloodstream infections. Initial treatment with caspofungin and daptomycin was deemed inappropriate, because blood cultures remained positive for both isolates after 14 days. The clinical pharmacological consultant suggested adding fluconazole and ceftobiprole to the ongoing antimicrobial therapy, and starting a real-time therapeutic drug monitoring program of daptomycin, ceftobiprole, and fluconazole, aimed at optimizing plasma exposures. Punctual minimum inhibitory concentration knowledge on the clinical isolates allowed attainment of the desired pharmacodynamic efficacy targets. Within few days, the patient greatly improved, as blood cultures became negative, and the inflammatory markers decreased to near normal values. This is a proof-of-concept of the importance of a therapeutic drug monitoring-based multidisciplinary approach in the proper management of complex antimicrobial therapy in special populations.
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Gregoire N, Chauzy A, Buyck J, Rammaert B, Couet W, Marchand S. Clinical Pharmacokinetics of Daptomycin. Clin Pharmacokinet 2020; 60:271-281. [PMID: 33313994 DOI: 10.1007/s40262-020-00968-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2020] [Indexed: 11/26/2022]
Abstract
Due to the low level of resistance observed with daptomycin, this antibiotic has an important place in the treatment of severe Gram-positive infections. It is the first-in-class of the group of calcium-dependent, membrane-binding lipopeptides, and is a cyclic peptide constituted of 13 amino acids and an n-decanoyl fatty acid chain. The antibacterial action of daptomycin requires its complexation with calcium. Daptomycin is not absorbed from the gastrointestinal tract and needs to be administered parenterally. The distribution of daptomycin is limited (volume of distribution of 0.1 L/kg in healthy volunteers) due to its negative charge at physiological pH and its high binding to plasma proteins (about 90%). Its elimination is mainly renal, with about 50% of the dose excreted unchanged in the urine, justifying dosage adjustment for patients with renal insufficiency. The pharmacokinetics of daptomycin are altered under certain pathophysiological conditions, resulting in high interindividual variability. As a result, therapeutic drug monitoring of daptomycin may be of interest for certain patients, such as intensive care unit patients, patients with renal or hepatic insufficiency, dialysis patients, obese patients, or children. A target for the ratio of the area under the curve to the minimum inhibitory concentration > 666 is usually recommended for clinical efficacy, whereas in order to limit the risk of undesirable muscular effects the residual concentration should not exceed 24.3 mg/L.
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Affiliation(s)
- Nicolas Gregoire
- INSERM, U1070, UFR de Médecine Pharmacie, Université de Poitiers, 1 rue Georges Bonnet, TSA 51106, 86073, Poitiers Cedex 9, France
- Laboratoire de Toxicologie-Pharmacocinétique, CHU of Poitiers, 2 rue de la Miletrie, 86000, Poitiers, France
| | - Alexia Chauzy
- INSERM, U1070, UFR de Médecine Pharmacie, Université de Poitiers, 1 rue Georges Bonnet, TSA 51106, 86073, Poitiers Cedex 9, France
| | - Julien Buyck
- INSERM, U1070, UFR de Médecine Pharmacie, Université de Poitiers, 1 rue Georges Bonnet, TSA 51106, 86073, Poitiers Cedex 9, France
| | - Blandine Rammaert
- INSERM, U1070, UFR de Médecine Pharmacie, Université de Poitiers, 1 rue Georges Bonnet, TSA 51106, 86073, Poitiers Cedex 9, France
- Service de maladies infectieuses et tropicales, CHU of Poitiers, 2 rue de la Miletrie, 86000, Poitiers, France
| | - William Couet
- INSERM, U1070, UFR de Médecine Pharmacie, Université de Poitiers, 1 rue Georges Bonnet, TSA 51106, 86073, Poitiers Cedex 9, France.
- Laboratoire de Toxicologie-Pharmacocinétique, CHU of Poitiers, 2 rue de la Miletrie, 86000, Poitiers, France.
| | - Sandrine Marchand
- INSERM, U1070, UFR de Médecine Pharmacie, Université de Poitiers, 1 rue Georges Bonnet, TSA 51106, 86073, Poitiers Cedex 9, France
- Laboratoire de Toxicologie-Pharmacocinétique, CHU of Poitiers, 2 rue de la Miletrie, 86000, Poitiers, France
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12
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Bricca R, Goutelle S, Roux S, Gagnieu MC, Becker A, Conrad A, Valour F, Laurent F, Triffault-Fillit C, Chidiac C, Ferry T. Genetic polymorphisms of ABCB1 (P-glycoprotein) as a covariate influencing daptomycin pharmacokinetics: a population analysis in patients with bone and joint infection. J Antimicrob Chemother 2020; 74:1012-1020. [PMID: 30629193 DOI: 10.1093/jac/dky541] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 11/08/2018] [Accepted: 11/27/2018] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Daptomycin has been recognized as a therapeutic option for the treatment of bone and joint infection (BJI). Gene polymorphism of ABCB1, the gene encoding P-glycoprotein (P-gp), may influence daptomycin pharmacokinetics (PK). OBJECTIVES We aimed to examine population PK of daptomycin and its determinants, including genetic factors, in patients with BJI. PATIENTS AND METHODS We analysed data from patients who received daptomycin for BJI between 2012 and 2016 in our regional reference centre and who had measured daptomycin concentrations and P-gp genotyping. A population approach was used to analyse PK data. In covariate analysis, we examined the influence of three single nucleotide variations (SNVs) of ABCB1 (3435C > T, 2677G > T/A and 1236C > T) and that of the corresponding haplotype on daptomycin PK parameters. Simulations performed with the final model examined the influence of covariates on the probability to achieve pharmacodynamic (PD) targets. RESULTS Data from 81 patients were analysed. Daptomycin body CL (CLDAP) correlated with CLCR and was 23% greater in males than in females. Daptomycin central V (V1) was allometrically scaled to body weight and was 25% lower in patients with homozygous CGC ABCB1 haplotype than in patients with any other genotype. Simulations performed with the model showed that sex and P-gp haplotype may influence the PTA for high MIC values and that a dosage of 10 mg/kg/24 h would optimize efficacy. CONCLUSIONS Daptomycin dosages higher than currently recommended should be evaluated in patients with BJI. Gender and P-gp gene polymorphism should be further examined as determinants of dosage requirements.
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Affiliation(s)
- Romain Bricca
- Hospices Civils de Lyon, Department of Infectious Diseases, Lyon, France
| | - Sylvain Goutelle
- Hospices Civils de Lyon, Groupement Hospitalier Nord, Service de Pharmacie, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, ISPB - Facultés de Médecine et de Pharmacie de Lyon, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, UMR CNRS 5558, Laboratoire de Biométrie et Biologie Evolutive, Villeurbanne, France
| | - Sandrine Roux
- Hospices Civils de Lyon, Department of Infectious Diseases, Lyon, France
| | - Marie-Claude Gagnieu
- Hospices Civils de Lyon, Groupement Hospitalier Sud, Laboratoire de Pharmacologie, Lyon, France
| | - Agathe Becker
- Hospices Civils de Lyon, Department of Infectious Diseases, Lyon, France
| | - Anne Conrad
- Hospices Civils de Lyon, Department of Infectious Diseases, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, ISPB - Facultés de Médecine et de Pharmacie de Lyon, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, International Centre for Research in Infectiology, CIRI, INSERM U1111, CNRS UMR5308, ENS de Lyon, Lyon, France
| | - Florent Valour
- Hospices Civils de Lyon, Department of Infectious Diseases, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, ISPB - Facultés de Médecine et de Pharmacie de Lyon, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, International Centre for Research in Infectiology, CIRI, INSERM U1111, CNRS UMR5308, ENS de Lyon, Lyon, France
| | - Frederic Laurent
- Univ Lyon, Université Claude Bernard Lyon 1, ISPB - Facultés de Médecine et de Pharmacie de Lyon, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, International Centre for Research in Infectiology, CIRI, INSERM U1111, CNRS UMR5308, ENS de Lyon, Lyon, France
| | | | - Christian Chidiac
- Hospices Civils de Lyon, Department of Infectious Diseases, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, ISPB - Facultés de Médecine et de Pharmacie de Lyon, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, International Centre for Research in Infectiology, CIRI, INSERM U1111, CNRS UMR5308, ENS de Lyon, Lyon, France
| | - Tristan Ferry
- Hospices Civils de Lyon, Department of Infectious Diseases, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, ISPB - Facultés de Médecine et de Pharmacie de Lyon, Lyon, France.,Univ Lyon, Université Claude Bernard Lyon 1, International Centre for Research in Infectiology, CIRI, INSERM U1111, CNRS UMR5308, ENS de Lyon, Lyon, France
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13
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Grégoire N, Marchand S, Ferrandière M, Lasocki S, Seguin P, Vourc'h M, Barbaz M, Gaillard T, Launey Y, Asehnoune K, Couet W, Mimoz O. Population pharmacokinetics of daptomycin in critically ill patients with various degrees of renal impairment. J Antimicrob Chemother 2020; 74:117-125. [PMID: 30295740 DOI: 10.1093/jac/dky374] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 08/20/2018] [Indexed: 11/13/2022] Open
Abstract
Objectives The objective of this study was to characterize the pharmacokinetics of unbound and total concentrations of daptomycin in infected ICU patients with various degrees of renal impairment. From these results, the probability of attaining antimicrobial efficacy and the risks of toxicity were assessed. Methods Twenty-four ICU patients with various renal functions and requiring treatment of complicated skin and soft-tissue infections, bacteraemia, or endocarditis with daptomycin were recruited. Daptomycin (Cubicin®) at 10 mg/kg was administered every 24 h for patients with creatinine clearance (CLCR) ≥30 mL/min and every 48 h for patients with CLCR <30 mL/min. Total and unbound plasma concentrations and urine concentrations of daptomycin were analysed simultaneously following a population pharmacokinetic approach. Simulations were conducted to estimate the probability of attaining efficacy (unbound AUCu/MIC >40 or >80) or toxicity (Cmin >24.3 mg/L) targets. Results Exposure to unbound daptomycin increased when the renal function decreased, thus increasing the probability of reaching the efficacy targets, but also the risk of toxicity. Modifications of the unbound fraction (fu) of daptomycin did not affect the pharmacokinetics of unbound daptomycin, but did affect the pharmacokinetics of total daptomycin. Conclusions Daptomycin at 10 mg/kg q24h allowed efficacy pharmacokinetic/pharmacodynamic targets for ICU patients with CLCR ≥30 mL/min to be reached. For patients with CLCR <30 mL/min, halving the rate of drug administration, i.e. 10 mg/kg q48h, was sufficient to reach these targets. No adverse events were observed, but the toxicity of the 10 mg/kg q24h dosing regimen should be further assessed, particularly for patients with altered renal function.
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Affiliation(s)
- Nicolas Grégoire
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France
| | - Sandrine Marchand
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France.,CHU de Poitiers, Service de Toxicologie-Pharmacocinétique, 2 rue de la milétrie, Poitiers, France
| | - Martine Ferrandière
- CHU de Tours, Service d'anesthésie et réanimation, 2 boulevard Tonnellé, Tours cedex 9, France
| | - Sigismond Lasocki
- CHU d'Angers, Service d'anesthésie et réanimation, 4 rue Larrey, Angers, France
| | - Philippe Seguin
- CHU de Rennes, Service de réanimation chirurgicale, 2 rue Henri Le Guilloux, Rennes, France
| | - Mickaël Vourc'h
- CHU de Nantes, Service d'anesthésie et réanimation, Hôtel Dieu, 1 Place Alexis-Ricordeau, Nantes, France
| | - Mathilde Barbaz
- CHU de Tours, Service d'anesthésie et réanimation, 2 boulevard Tonnellé, Tours cedex 9, France
| | - Thomas Gaillard
- CHU d'Angers, Service d'anesthésie et réanimation, 4 rue Larrey, Angers, France
| | - Yoann Launey
- CHU de Rennes, Service de réanimation chirurgicale, 2 rue Henri Le Guilloux, Rennes, France
| | - Karim Asehnoune
- CHU de Nantes, Service d'anesthésie et réanimation, Hôtel Dieu, 1 Place Alexis-Ricordeau, Nantes, France
| | - William Couet
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France.,CHU de Poitiers, Service de Toxicologie-Pharmacocinétique, 2 rue de la milétrie, Poitiers, France
| | - Olivier Mimoz
- Inserm U1070, Pôle Biologie Santé, 1 rue Georges Bonnet, Poitiers, France.,Université de Poitiers, UFR Médecine-Pharmacie, 6 rue de la milétrie, Poitiers, France.,CHU de Poitiers, Service des Urgences - SAMU 86 - SMUR, 2 rue de la milétrie, Poitiers, France
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14
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Tsukada H, Tsuji Y, Yamashina T, Tsuruta M, Hiraki Y, Tsuruyama M, Ogami C, Kawasuji H, Sakamaki I, Yamamoto Y. Pharmacokinetics and pharmacodynamics of daptomycin in a clinical setting. J Infect Chemother 2019; 26:230-235. [PMID: 31735632 DOI: 10.1016/j.jiac.2019.08.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 08/22/2019] [Accepted: 08/27/2019] [Indexed: 01/10/2023]
Abstract
We investigated achievement of a target 24-h area under the concentration-time curve to minimum inhibitory concentration ratio (AUC/MIC) ≥666 and the factors influencing this ratio in patients who received daptomycin (DAP) for infectious disease treatment in a clinical setting. The target AUC/MIC was obtained in 6 patients (35.3%) at a 4-6 mg/kg dose (Group_4-6 mg/kg) and in 4 (18.2%) at a >6 mg/kg dose (Group_>6 mg/kg). There was a significant difference in clearance of DAP (CL_DAP) between these groups, but no other difference in characteristics. Multiple linear regression analysis was performed for prediction of AUC ≥666 based on patient factors and the presence or absence of sepsis. In a stepwise analysis, serum creatinine (SCr) was a significant predictor of AUC, but this parameter explained only 13% of the variance in achievement of the target AUC. These results show that the target AUC/MIC may or may not be achieved at the doses used in Group_4-6 mg/kg and Group_>6 mg/kg. Receiver operating characteristic analysis suggested that a CL_DAP >0.450 L/hr may lead to failure to reach the target AUC/MIC. Therefore, regardless of dose, the efficacy of DAP should be monitored closely to prevent failure of infectious disease treatment, particularly because therapeutic drug monitoring of DAP is limited by difficulty measuring the DAP serum concentration at many medical facilities. Our findings are preliminary, and a further study is required to identify factors that increase CL_DAP and to enable dose adjustment of DAP.
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Affiliation(s)
- Hiroko Tsukada
- Department of Pharmacy, National Hospital Organization Beppu Medical Center, 1473 Uchikamado, Beppu, Oita, 874-0011, Japan
| | - Yasuhiro Tsuji
- Center for Pharmacist Education, School of Pharmacy, Nihon University, 7-7-1 Narashinodai, Funabashi, Chiba, 274-8555, Japan
| | - Takuya Yamashina
- Department of Pharmacy, National Hospital Organization Beppu Medical Center, 1473 Uchikamado, Beppu, Oita, 874-0011, Japan
| | - Minako Tsuruta
- Department of Pharmacy, National Hospital Organization Beppu Medical Center, 1473 Uchikamado, Beppu, Oita, 874-0011, Japan
| | - Yoichi Hiraki
- Department of Pharmacy, National Hospital Organization Beppu Medical Center, 1473 Uchikamado, Beppu, Oita, 874-0011, Japan
| | - Moeko Tsuruyama
- Department of Pharmacy, National Hospital Organization Kyushu Medical Center, 1-8-1 Jigyohama, Chuo-ku, Fukuoka, 810-8563, Japan
| | - Chika Ogami
- Department of Medical Pharmaceutics, Faculty of Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama City, Toyama, 930-0194, Japan
| | - Hitoshi Kawasuji
- Department of Clinical Infectious Diseases, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, 2630 Sugitani, Toyama City, Toyama, 930-0194, Japan
| | - Ippei Sakamaki
- Department of Clinical Infectious Diseases, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, 2630 Sugitani, Toyama City, Toyama, 930-0194, Japan
| | - Yoshihiro Yamamoto
- Department of Clinical Infectious Diseases, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, 2630 Sugitani, Toyama City, Toyama, 930-0194, Japan.
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15
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Giannella M, Bartoletti M, Gatti M, Viale P. Advances in the therapy of bacterial bloodstream infections. Clin Microbiol Infect 2019; 26:158-167. [PMID: 31733377 DOI: 10.1016/j.cmi.2019.11.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 10/30/2019] [Accepted: 11/02/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND Advances in the diagnostic and therapeutic management of patients with bloodstream infections (BSIs) have been achieved in the last years, improving clinical outcome. However, mortality associated with some pathogens, such as Staphylococcus aureus and Enterococcus spp., is still high. In addition, the spread of antibiotic resistance, mainly among Gram-negative bacteria, reduces treatment options in some circumstances. Therefore, interest in new drugs, combination regimens and optimal dosing schedules is rising. OBJECTIVES Our aim is to summarize the current evidence on available antibiotic regimens for patients with bacterial BSI, focusing on drug choice, combination regimens and optimal dosing schedules. We selected bacteria that are difficult to manage because of virulence factors (i.e. methicillin-susceptible S. aureus), tolerance to antibiotic activity (i.e. Enterococcus faecalis), and/or susceptibility patterns (i.e. methicillin-resistant S. aureus, vancomycin-resistant enterococci, carbapenem-resistant Enterobacteriaceae, multidrug-resistant Pseudomonas aeruginosa and carbapenem-resistant Acinetobacter baumannii). SOURCES MEDLINE search with English language and publication in the last 5 years as limits. CONTENT AND IMPLICATIONS The literature gaps on the use of new drugs, the uncertainties regarding the use of combination regimens, and the need to optimize dosing schedules in some circumstances (e.g. augmented renal clearance, renal replacement therapy, high inoculum BSI sources, and isolation of bacteria showing high MICs) have been revised.
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Affiliation(s)
- M Giannella
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola Malpighi, University of Bologna, Bologna, Italy.
| | - M Bartoletti
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola Malpighi, University of Bologna, Bologna, Italy
| | - M Gatti
- Pharmacology Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola Malpighi, University of Bologna, Bologna, Italy
| | - P Viale
- Infectious Diseases Unit, Department of Medical and Surgical Sciences, Policlinico Sant'Orsola Malpighi, University of Bologna, Bologna, Italy
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16
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Foolad F, Taylor BD, Shelburne SA, Arias CA, Aitken SL. Association of daptomycin dosing regimen and mortality in patients with VRE bacteraemia: a review. J Antimicrob Chemother 2019; 73:2277-2283. [PMID: 29547977 DOI: 10.1093/jac/dky072] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
VRE are associated with ∼1300 deaths per year in the USA. Recent literature suggests that daptomycin, a cyclic lipopeptide antibiotic with concentration-dependent bactericidal activity, is the preferred treatment option for VRE bacteraemia, yet the optimal dosing strategy for this indication has not been established. In vitro evidence suggests that higher-than-labelled doses of daptomycin are required to optimally treat VRE bacteraemia and to inhibit the development of resistance. However, concern of dose-dependent toxicities, notably increases in creatine phosphokinase and the development of rhabdomyolysis, are a barrier to initiating high-dose schemes in clinical practice. Thus, the effectiveness and safety of high-dose daptomycin regimens in clinical practice have remained unclear. While early studies failed to identify differences in mortality, newer, larger investigations suggest high-dose (≥9 mg/kg) daptomycin is associated with reduced mortality in patients with VRE bacteraemia compared with standard (6 mg/kg) dosing regimens. Additionally, the high-dose regimens appear to be safe and may be associated with improved microbiological outcomes. The purpose of this review is to examine the published evidence on the effectiveness and safety of high-dose daptomycin compared with standard dosing regimens for VRE bacteraemia.
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Affiliation(s)
- Farnaz Foolad
- Division of Pharmacy, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Brandie D Taylor
- Department of Epidemiology and Biostatistics, Texas A&M University, College Station, TX, USA
| | - Samuel A Shelburne
- Department of Infectious Diseases, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Department of Genomic Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Center for Antimicrobial Resistance and Microbial Genomics (CARMiG) and Division of Infectious Diseases, UTHealth McGovern Medical School, Houston, TX, USA
| | - Cesar A Arias
- Center for Antimicrobial Resistance and Microbial Genomics (CARMiG) and Division of Infectious Diseases, UTHealth McGovern Medical School, Houston, TX, USA.,Center for Infectious Diseases, UTHealth School of Public Health, Houston, TX, USA.,Department of Microbiology and Molecular Genetics, UTHealth McGovern Medical School, Houston, TX, USA.,Molecular Genetics and Antimicrobial Resistance Unit-International Center for Microbial Genomics, Universidad El Bosque, Bogotá, Colombia
| | - Samuel L Aitken
- Division of Pharmacy, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.,Center for Antimicrobial Resistance and Microbial Genomics (CARMiG) and Division of Infectious Diseases, UTHealth McGovern Medical School, Houston, TX, USA
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17
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Bassetti M, Peghin M, Castaldo N, Giacobbe DR. The safety of treatment options for acute bacterial skin and skin structure infections. Expert Opin Drug Saf 2019; 18:635-650. [PMID: 31106600 DOI: 10.1080/14740338.2019.1621288] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Acute bacterial skin and skin-structure infections (ABSSSI) may develop in both in-patients and out-patients, possibly with a severe clinical presentation. Since most phase 3 randomized clinical trials have shown non-inferiority in efficacy across different agents, considerations regarding their different safety profiles inevitably play a crucial role in the everyday choice about which of them should be employed for the treatment of ABSSSI. AREAS COVERED In this review, the authors discuss the safety profile of different treatment options for ABSSSI. EXPERT OPINION The spread of methicillin-resistant Staphylococcus aureus (MRSA) in the last decades has inevitably influenced the therapeutic approach to ABSSSI. Adequate knowledge of the peculiar toxicity profile of each drug active against MRSA is essential for guiding, monitoring and managing adverse events, in turn reducing any unfavorable impact of toxicity on patients' outcomes. In the next five years, potential toxicity will play a critical role in establishing the best available therapy for each specific patient, together with consideration regarding the possibility of avoiding hospitalization or allowing a switch from intravenous to oral therapy and early discharge.
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Affiliation(s)
- Matteo Bassetti
- a Infectious Diseases Clinic, Department of Medicine, University of Udine and Azienda Sanitaria Universitaria Integrata di Udine , Udine , Italy.,b Department of Health Sciences, University of Genoa , Genoa , Italy
| | - Maddalena Peghin
- a Infectious Diseases Clinic, Department of Medicine, University of Udine and Azienda Sanitaria Universitaria Integrata di Udine , Udine , Italy
| | - Nadia Castaldo
- a Infectious Diseases Clinic, Department of Medicine, University of Udine and Azienda Sanitaria Universitaria Integrata di Udine , Udine , Italy
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18
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Clinical pharmacokinetic and pharmacodynamic analysis of daptomycin and the necessity of high-dose regimen in Japanese adult patients. J Infect Chemother 2019; 25:437-443. [DOI: 10.1016/j.jiac.2019.01.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 01/13/2019] [Accepted: 01/22/2019] [Indexed: 11/17/2022]
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19
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Considerations for Dose Selection and Clinical Pharmacokinetics/Pharmacodynamics for the Development of Antibacterial Agents. Antimicrob Agents Chemother 2019; 63:AAC.02309-18. [PMID: 30833427 PMCID: PMC6496063 DOI: 10.1128/aac.02309-18] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In June 2017, The National Institute of Allergy and Infectious Diseases, part of the National Institutes of Health, organized a workshop entitled "Pharmacokinetics-Pharmacodynamics (PK/PD) for Development of Therapeutics against Bacterial Pathogens" to discuss details and critical parameters of various PK/PD methods and identify approaches for linking human pharmacokinetic (PK) data and drug efficacy analyses. The workshop participants included individuals from academia, industry, and government. This and the accompanying minireview on nonclinical PK/PD summarize the workshop discussions and recommendations. It is important to consider how information like PK/PD can support the clinical effectiveness of new antibacterial drugs, as PK/PD data have become central to antibacterial drug development programs. Key clinical considerations for antibacterial dose selection and clinical PK/PD characterization discussed in this minireview include a robust assessment of PK in the patient population of interest, critical considerations for assessing drug penetration in the lung for the treatment of pneumonia, and an emphasis on special populations, including patients with renal impairment and augmented renal function, as well as on dosing in obese and pediatric patients. Successful application of such approaches is now used to provide a more informative drug development package to support the approval of new antibiotics.
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20
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Generating Robust and Informative Nonclinical In Vitro and In Vivo Bacterial Infection Model Efficacy Data To Support Translation to Humans. Antimicrob Agents Chemother 2019; 63:AAC.02307-18. [PMID: 30833428 PMCID: PMC6496039 DOI: 10.1128/aac.02307-18] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
In June 2017, the National Institute of Allergy and Infectious Diseases, part of the National Institutes of Health, organized a workshop entitled “Pharmacokinetics-Pharmacodynamics (PK/PD) for Development of Therapeutics against Bacterial Pathogens.” The aims were to discuss details of various PK/PD models and identify sound practices for deriving and utilizing PK/PD relationships to design optimal dosage regimens for patients. Workshop participants encompassed individuals from academia, industry, and government, including the United States Food and Drug Administration. In June 2017, the National Institute of Allergy and Infectious Diseases, part of the National Institutes of Health, organized a workshop entitled “Pharmacokinetics-Pharmacodynamics (PK/PD) for Development of Therapeutics against Bacterial Pathogens.” The aims were to discuss details of various PK/PD models and identify sound practices for deriving and utilizing PK/PD relationships to design optimal dosage regimens for patients. Workshop participants encompassed individuals from academia, industry, and government, including the United States Food and Drug Administration. This and the accompanying review on clinical PK/PD summarize the workshop discussions and recommendations. Nonclinical PK/PD models play a critical role in designing human dosage regimens and are essential tools for drug development. These include in vitro and in vivo efficacy models that provide valuable and complementary information for dose selection and translation from the laboratory to human. It is crucial that studies be designed, conducted, and interpreted appropriately. For antibacterial PK/PD, extensive published data and expertise are available. These have been leveraged to develop recommendations, identify common pitfalls, and describe the applications, strengths, and limitations of various nonclinical infection models and translational approaches. Despite these robust tools and published guidance, characterizing nonclinical PK/PD relationships may not be straightforward, especially for a new drug or new class. Antimicrobial PK/PD is an evolving discipline that needs to adapt to future research and development needs. Open communication between academia, pharmaceutical industry, government, and regulatory bodies is essential to share perspectives and collectively solve future challenges.
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21
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Blanquart F. Evolutionary epidemiology models to predict the dynamics of antibiotic resistance. Evol Appl 2019; 12:365-383. [PMID: 30828361 PMCID: PMC6383707 DOI: 10.1111/eva.12753] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 11/22/2018] [Accepted: 11/29/2018] [Indexed: 12/12/2022] Open
Abstract
The evolution of resistance to antibiotics is a major public health problem and an example of rapid adaptation under natural selection by antibiotics. The dynamics of antibiotic resistance within and between hosts can be understood in the light of mathematical models that describe the epidemiology and evolution of the bacterial population. "Between-host" models describe the spread of resistance in the host community, and in more specific settings such as hospitalized hosts (treated by antibiotics at a high rate), or farm animals. These models make predictions on the best strategies to limit the spread of resistance, such as reducing transmission or adapting the prescription of several antibiotics. Models can be fitted to epidemiological data in the context of intensive care units or hospitals to predict the impact of interventions on resistance. It has proven harder to explain the dynamics of resistance in the community at large, in particular because models often do not reproduce the observed coexistence of drug-sensitive and drug-resistant strains. "Within-host" models describe the evolution of resistance within the treated host. They show that the risk of resistance emergence is maximal at an intermediate antibiotic dose, and some models successfully explain experimental data. New models that include the complex host population structure, the interaction between resistance-determining loci and other loci, or integrating the within- and between-host levels will allow better interpretation of epidemiological and genomic data from common pathogens and better prediction of the evolution of resistance.
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Affiliation(s)
- François Blanquart
- Centre for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERMPSL Research UniversityParisFrance
- IAME, UMR 1137, INSERMUniversité Paris DiderotParisFrance
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22
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Fox AN, Smith WJ, Kupiec KE, Harding SJ, Resman-Targoff BH, Neely SB, White BP, Owens RE. Daptomycin dosing in obese patients: analysis of the use of adjusted body weight versus actual body weight. Ther Adv Infect Dis 2019; 6:2049936118820230. [PMID: 30728962 PMCID: PMC6354309 DOI: 10.1177/2049936118820230] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 11/27/2018] [Indexed: 12/26/2022] Open
Abstract
Background Food and Drug Administration-approved daptomycin dosing uses actual body weight, despite limited dosing information for obese patients. Studies report alterations in daptomycin pharmacokinetics and creatine phosphokinase elevations associated with higher weight-based doses required for obese patients. Limited information regarding clinical outcomes with alternative daptomycin dosing strategies in obesity exists. Objective This study evaluates equivalency of clinical and safety outcomes in obese patients with daptomycin dosed on adjusted body weight versus a historical cohort using actual body weight. Methods This retrospective, single center study compared equivalency of outcomes with two one-sided tests in patients with body mass index ⩾30 kg/m2 who received daptomycin dosed on actual body weight versus adjusted body weight. The primary outcome was clinical failure. Secondary outcomes included 90-day readmission and 90-day mortality. A combined safety endpoint included creatine phosphokinase elevation, patient-reported myopathy, and rhabdomyolysis. Results A total of 667 patients were screened for inclusion; 101 patients were analyzed with 50 in the actual body weight cohort and 51 in the adjusted body weight cohort. The two regimens were statistically equivalent for clinical failure (2% actual body weight versus 4% adjusted body weight; p < 0.001 for equivalency). The two regimens were also statistically equivalent for 90-day mortality (6% actual body weight versus 4% adjusted body weight; p = 0.0014 for equivalency). Limitations include single center, retrospective design, and sample size. Daptomycin dosing intensified throughout the study period. Conclusion The two daptomycin dosing cohorts were statistically equivalent for both clinical failure and 90-day mortality. More data are needed to assess outcomes with higher (⩾8 mg/kg/day) daptomycin doses in this patient population.
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Affiliation(s)
- Ashley N Fox
- Department of Pharmacy: Clinical and Administrative Sciences, College of Pharmacy, The University of Oklahoma, Oklahoma City, OK, USA
| | - Winter J Smith
- Department of Clinical Sciences, The Ben and Maytee Fisch College of Pharmacy, The University of Texas at Tyler, Tyler, TX, USA
| | - Katherine E Kupiec
- Department of Clinical Pharmacy, OU Medical Center, Oklahoma City, OK, USA
| | | | - Beth H Resman-Targoff
- Department of Pharmacy: Clinical and Administrative Sciences, College of Pharmacy, The University of Oklahoma, Oklahoma City, OK, USA
| | - Stephen B Neely
- Office of Instructional Science and Assessment, College of Pharmacy, The University of Oklahoma, Oklahoma City, OK, USA
| | - Bryan P White
- Department of Clinical Pharmacy, OU Medical Center, Oklahoma City, OK, USA
| | - Ryan E Owens
- Department of Pharmacy Practice, Wingate University School of Pharmacy, Hendersonville, NC, USA
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23
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Drusano GL, Louie A. Breakpoint determination when multiple organisms are tested for effect targets. Eur J Pharm Sci 2019; 130:196-199. [PMID: 30711687 DOI: 10.1016/j.ejps.2019.01.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 11/22/2018] [Accepted: 01/29/2019] [Indexed: 11/25/2022]
Abstract
Determination of the susceptibility breakpoint for antibiotics is important, as it guides the use of agents in the clinical setting. Currently, breakpoints are often evaluated using a Probability of Target Attainment Analysis in which the targets are set through pre-clinical experiments, often by examining a strain of a target pathogen in a murine model such as a neutropenic thigh infection model. However, regulatory authorities are often rightly concerned about the setting of breakpoints when a number of isolates of target pathogens are evaluated and there is a sizeable spread of the drug exposures necessary to achieve the target with a sufficiently high (usually 90%) probability. Here, we propose a method for supporting a breakpoint determination for this circumstance. We examined 8 isolates of resistant Enterobacteriaceae in a neutropenic murine thigh infection model. The stasis exposure was determined and ranged from 5.70 to 43.5 AUC/MIC Ratio. The mean ± standard deviation was 20.05 ± 13.05. A 5000-iterate Monte Carlo simulation was performed to generate a range of stasis targets and Probability of Target Attainment Analyses were calculated at the 1st, 5th, 10th, 25th, 50th, 75th, 90th, 95th, and 99th percentiles of the distribution. Breakpoints were determined at each percentile. Breakpoints ranged from 2 mg/L to 32 mg/L. A weighted (by the percentages of the distribution) breakpoint was calculated and determined to be 4 mg/L. This method is a rational approach to identifying breakpoints when there is substantial between-isolate variability in exposure targets.
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Affiliation(s)
- G L Drusano
- Institute for Therapeutic Innovation, University of Florida.
| | - Arnold Louie
- Institute for Therapeutic Innovation, University of Florida
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24
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Randomized Multicenter Study Comparing Safety and Efficacy of Daptomycin Versus Standard-of-care in Pediatric Patients With Staphylococcal Bacteremia. Pediatr Infect Dis J 2018; 37:893-900. [PMID: 29406465 DOI: 10.1097/inf.0000000000001926] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Staphylococcus aureus, including community-associated methicillin-resistant S. aureus, is an important cause of pediatric bacteremia. Daptomycin is a well-established treatment option for Gram-positive bacteremia in adults, but its safety and efficacy in children require confirmation. METHODS This was a randomized (2:1), evaluator-blinded, multicenter, phase 4 clinical trial comparing intravenous daptomycin with standard-of-care (SOC) for treatment of S. aureus bacteremia in 1- to 17-year-old patients (Clinicaltrials.gov: NCT01728376). Total treatment duration (intravenous followed by oral step-down therapy) was 5-42 days. Daptomycin was dosed once daily by patient age: 12-17 years, 7 mg/kg; 7-11 years, 9 mg/kg and 1-6 years, 12 mg/kg. The primary objective was to evaluate daptomycin safety in children who received ≥1 dose; secondary objectives included comparing daptomycin efficacy with SOC (the trial was not designed to confirm noninferiority) and pharmacokinetic analysis. RESULTS Fifty-five children were randomized to daptomycin and 27 to SOC (primarily vancomycin or cefazolin); 90% had S. aureus. In both groups, 15% of patients had drug-related adverse events, primarily diarrhea (4% daptomycin, 8% SOC) and increased creatine phosphokinase (4% daptomycin, 0% SOC). Clinical success (blinded evaluator-assessed complete/partial resolution of bacteremia signs and symptoms 7-14 days after end-of-treatment) rates were similar for daptomycin (88%) and SOC (77%; 95% confidence interval for difference: -9% to 31%). Daptomycin plasma levels across age groups were comparable with those in adults receiving daptomycin at 6 mg/kg. CONCLUSIONS Once-daily, age-appropriate daptomycin was well tolerated in children with staphylococcal bacteremia; efficacy was comparable with SOC. Daptomycin in age-adjusted doses is a safe treatment alternative in this setting.
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Trang M, Dudley MN, Bhavnani SM. Use of Monte Carlo simulation and considerations for PK-PD targets to support antibacterial dose selection. Curr Opin Pharmacol 2017; 36:107-113. [PMID: 29128853 DOI: 10.1016/j.coph.2017.09.009] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 09/20/2017] [Accepted: 09/21/2017] [Indexed: 11/28/2022]
Abstract
Monte Carlo simulation is used to generate data for pharmacokinetic-pharmacodynamic (PK-PD) target attainment analyses to assess antibacterial dosing regimens in early and late stage drug development. Careful consideration of the quality of data for pharmacokinetics, non-clinical PK-PD targets for efficacy, the choice of the bacterial reduction endpoint upon which the PK-PD target is based, variability in the PK-PD target, and effect site exposures ensures optimal dose selection. Relationships between drug exposure and efficacy and/or safety endpoints based on clinical data can also be applied to simulated data to support dose selection. These in silico analyses, conducted throughout drug development, provide the greatest opportunity to de-risk the development of antibacterial agents.
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Affiliation(s)
- Michael Trang
- The Institute for Clinical Pharmacodynamics, Inc, Schenectady, NY, United States
| | | | - Sujata M Bhavnani
- The Institute for Clinical Pharmacodynamics, Inc, Schenectady, NY, United States
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26
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Flamm RK, Sader HS, Castanheira M, Jones RN. The application of in vitro surveillance data for antibacterial dose selection. Curr Opin Pharmacol 2017; 36:130-138. [DOI: 10.1016/j.coph.2017.10.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 09/28/2017] [Accepted: 10/20/2017] [Indexed: 12/21/2022]
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27
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Bradley J, Glasser C, Patino H, Arnold SR, Arrieta A, Congeni B, Daum RS, Kojaoghlanian T, Yoon M, Anastasiou D, Wolf DJ, Bokesch P. Daptomycin for Complicated Skin Infections: A Randomized Trial. Pediatrics 2017; 139:peds.2016-2477. [PMID: 28202770 DOI: 10.1542/peds.2016-2477] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/09/2016] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Complicated skin and skin structure infections (cSSSI) are common in children. Due to safety and resistance issues with recommended agents, new treatment options would be advantageous. METHODS Multicenter, evaluator-blinded clinical trial. Patients 1 to 17 years old with cSSSI caused by Gram-positive pathogens were randomized 2:1 to intravenous daptomycin or standard-of-care (SOC) treatment for ≤14 days. Daptomycin was administered once daily with dosing by patient age: 12 to 17 years, 5 mg/kg; 7 to 11 years, 7 mg/kg; 2 to 6 years, 9 mg/kg; 12 to 23 months, 10 mg/kg. The primary objective was to evaluate daptomycin safety. The secondary objective was to assess the efficacy of daptomycin compared with SOC. The intent-to-treat (ITT) population consisted of all randomized patients with any dose of study drug. RESULTS The ITT population comprised 257 daptomycin and 132 SOC patients (primarily clindamycin or vancomycin); 35% had confirmed methicillin-resistant Staphylococcus aureus. The most common adverse events were diarrhea (7% daptomycin, 5% SOC) and increased creatine phosphokinase (6% daptomycin, 5% SOC). The proportions of safety population patients with treatment-related adverse events were similar between the daptomycin (14%) and SOC (17%) groups. Clinical success rates (blinded evaluator-assessed complete/partial resolution of cSSSI signs and symptoms 7-14 days after end-of-treatment) in the ITT population were also similar for the daptomycin (91%) and SOC groups. CONCLUSIONS Once-daily daptomycin was well tolerated, with safety and efficacy comparable to SOC in children/adolescents with cSSSI caused by Gram-positive pathogens, including community-acquired methicillin-resistant S aureus.
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Affiliation(s)
- John Bradley
- Division of Infectious Diseases, Department of Pediatrics, University of California San Diego, San Diego, California; .,Rady Children's Hospital, San Diego, California
| | | | | | - Sandra R Arnold
- University of Tennessee Health Science Center, Le Bonheur Children's Hospital, Memphis, Tennessee
| | | | | | - Robert S Daum
- MRSA Research Center, Department of Pediatrics, University of Chicago, Chicago, Illinois; and
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Relationship between Fosfomycin Exposure and Amplification of Escherichia coli Subpopulations with Reduced Susceptibility in a Hollow-Fiber Infection Model. Antimicrob Agents Chemother 2016; 60:5141-5. [PMID: 27270274 DOI: 10.1128/aac.00355-16] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 05/27/2016] [Indexed: 01/21/2023] Open
Abstract
Understanding the relationship between antibiotic exposure and amplification of bacterial subpopulations with reduced drug susceptibility over time is important for evaluating the adequacy of dosing regimens. We utilized a hollow-fiber infection model to identify the fosfomycin intravenous dosing regimens that prevented the amplification of Escherichia coli bacterial subpopulations with reduced fosfomycin susceptibility. The challenge isolate was E. coli ATCC 25922 (agar MIC with glucose-6-phosphate, 1 mg/liter; agar MIC without glucose-6-phosphate, 32 mg/liter). The fosfomycin dosing regimens studied were 1 to 12 g every 8 h for 10 days to approximate that planned for clinical use. The studies included a no-treatment control regimen. Two bacterial subpopulations were identified, one with reduced susceptibility with agar MIC values ranging from 32 to 128 mg/liter and the other resistant with agar MIC values of 256 to >1,024 mg/liter on plates containing 5× and 256× the baseline MIC value, respectively. An inverted-U-shaped function best described the relationship between the amplification of the two bacterial subpopulations and drug exposure. The lowest fosfomycin dosing regimen that did not amplify a bacterial subpopulation with reduced susceptibility was 4 g administered every 8 h. Nearly immediate amplification of bacterial subpopulations with reduced susceptibility was observed with fosfomycin dosing regimens consisting of 1 to 2 g every 8 h. These data will be useful to support the selection of fosfomycin dosing regimens that minimize the potential for on-therapy amplification of bacterial subpopulations with reduced susceptibility.
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