Samit Ganguly1,2, Andrea N Edginton3, Jacqueline G Gerhart1, Michael Cohen-Wolkowiez4,5, Rachel G Greenberg4,5, Daniel Gonzalez6. 1. Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, 301 Pharmacy Lane, Campus Box #7569, Chapel Hill, NC, 27599-7569, USA. 2. Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA. 3. School of Pharmacy, University of Waterloo, Kitchener, ON, Canada. 4. Duke Clinical Research Institute, Durham, NC, USA. 5. Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA. 6. Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, 301 Pharmacy Lane, Campus Box #7569, Chapel Hill, NC, 27599-7569, USA. daniel.gonzalez@unc.edu.
Abstract
BACKGROUND: Meropenem is a broad-spectrum carbapenem antibiotic approved by the US Food and Drug Administration for use in pediatric patients, including treating complicated intra-abdominal infections in infants < 3 months of age. The impact of maturation in glomerular filtration rate and tubular secretion by renal transporters on meropenem pharmacokinetics, and the effect on meropenem dosing, remains unknown. We applied physiologically based pharmacokinetic (PBPK) modeling to characterize the disposition of meropenem in preterm and term infants. METHODS: An adult meropenem PBPK model was developed in PK-Sim® (Version 8) and scaled to infants accounting for renal transporter ontogeny and glomerular filtration rate maturation. The PBPK model was evaluated using 645 plasma concentrations from 181 infants (gestational age 23-40 weeks; postnatal age 1-95 days). The PBPK model-based simulations were performed to evaluate meropenem dosing in the product label for infants < 3 months of age treated for complicated intra-abdominal infections. RESULTS: Our model predicted plasma concentrations in infants in agreement with the observed data (average fold error of 0.90). The PBPK model-predicted clearance in a virtual infant population was successfully able to capture the post hoc estimated clearance of meropenem in this population, estimated by a previously published model. For 90% of virtual infants, a 4-mg/L target plasma concentration was achieved for > 50% of the dosing interval following product label-recommended dosing. CONCLUSIONS: Our PBPK model supports the meropenem dosing regimens recommended in the product label for infants <3 months of age.
BACKGROUND: Meropenem is a broad-spectrum carbapenem antibiotic approved by the US Food and Drug Administration for use in pediatric patients, including treating complicated intra-abdominal infections in infants < 3 months of age. The impact of maturation in glomerular filtration rate and tubular secretion by renal transporters on meropenem pharmacokinetics, and the effect on meropenem dosing, remains unknown. We applied physiologically based pharmacokinetic (PBPK) modeling to characterize the disposition of meropenem in preterm and term infants. METHODS: An adult meropenem PBPK model was developed in PK-Sim® (Version 8) and scaled to infants accounting for renal transporter ontogeny and glomerular filtration rate maturation. The PBPK model was evaluated using 645 plasma concentrations from 181 infants (gestational age 23-40 weeks; postnatal age 1-95 days). The PBPK model-based simulations were performed to evaluate meropenem dosing in the product label for infants < 3 months of age treated for complicated intra-abdominal infections. RESULTS: Our model predicted plasma concentrations in infants in agreement with the observed data (average fold error of 0.90). The PBPK model-predicted clearance in a virtual infant population was successfully able to capture the post hoc estimated clearance of meropenem in this population, estimated by a previously published model. For 90% of virtual infants, a 4-mg/L target plasma concentration was achieved for > 50% of the dosing interval following product label-recommended dosing. CONCLUSIONS: Our PBPK model supports the meropenem dosing regimens recommended in the product label for infants <3 months of age.
Authors: Elizabeth J Thompson; Huali Wu; Anil Maharaj; Andrea N Edginton; Stephen J Balevic; Marjan Cobbaert; Anthony P Cunningham; Christoph P Hornik; Michael Cohen-Wolkowiez Journal: Clin Pharmacokinet Date: 2019-07 Impact factor: 6.447
Authors: Emily M Hsieh; Christoph P Hornik; Reese H Clark; Matthew M Laughon; Daniel K Benjamin; P Brian Smith Journal: Am J Perinatol Date: 2013-12-17 Impact factor: 3.079