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Related Concept Videos

Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

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It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
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Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations01:15

Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations

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Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
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Analysis of Population Pharmacokinetic Data01:12

Analysis of Population Pharmacokinetic Data

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Analysis of population pharmacokinetic data involves studying the behavior of drugs within diverse populations to understand their pharmacokinetic parameters. Traditional pharmacokinetic methods typically involve collecting samples from a few individuals and estimating these parameters. While these methods are commonly used, they have limitations in capturing the variability in drug response among individuals or heterogeneous populations. Population pharmacokinetics is employed to address these...
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Drug Dosing: Infants and Children01:29

Drug Dosing: Infants and Children

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Pediatric patient dosages diverge from adults due to disparities in body surface area, total body water, and extracellular fluid per kilogram of body weight. The dosing regimen considers the variations in pharmacokinetics and pharmacology across distinct age groups, encompassing preterm newborns, infants, young children, older children, and adolescents. Calculation of pediatric patient doses is predicated on determining body surface area, which exhibits a superior correlation with the child's...
32
Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

17
A loading dose is an essential pharmacological strategy to rapidly achieve the target plasma drug concentration necessary for an immediate therapeutic effect. This approach is especially critical for drugs characterized by slow absorption or extended half-lives, where delaying therapeutic plasma levels could compromise treatment outcomes. By administering a loading dose, clinicians ensure a prompt onset of drug action, even for agents with complex pharmacokinetic profiles.Achieving steady-state...
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Dosage Regimens: Designs and Approaches01:28

Dosage Regimens: Designs and Approaches

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Designing a dosage regimen, which refers to the manner of drug administration, is a complex process involving the selection of drug dose, route, and frequency. This process is underpinned by pharmacokinetic parameters derived from tests and population averages. These parameters are then tailored to patient-specific variables such as diagnosis, demographics, and allergy status. Once therapy commences, therapeutic response monitoring is critical and achieved through clinical and physical...
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Related Experiment Video

Updated: Oct 10, 2025

Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses
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Cefepime Precision Dosing Tool: from Standard to Precise Dose Using Nonparametric Population Pharmacokinetics.

Mohammad H Alshaer1,2, Sylvain Goutelle3,4,5, Barbara A Santevecchi2

  • 1Infectious Disease Pharmacokinetics Lab, Emerging Pathogens Institute, University of Floridagrid.15276.37, Gainesville, Florida, USA.

Antimicrobial Agents and Chemotherapy
|December 13, 2021
PubMed
Summary

A new cefepime pharmacokinetic model was developed and validated for precision dosing. This model, integrated into the BestDose tool, accurately predicts cefepime concentrations, enabling optimized dosing strategies.

Keywords:
cefepimepharmacokineticsprecision dosing

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Area of Science:

  • Pharmacokinetics and Pharmacodynamics
  • Clinical Pharmacology
  • Computational Drug Dosing

Background:

  • Cefepime is a widely used cephalosporin antibiotic in hospitals.
  • Accurate dosing is crucial for therapeutic efficacy and minimizing resistance.
  • Existing dosing strategies may not account for individual patient variability.

Purpose of the Study:

  • To develop and validate a population pharmacokinetic (PK) model for cefepime.
  • To integrate the PK model into a precision dosing tool (BestDose).
  • To generate an optimal initial dose (OID) algorithm for cefepime therapy.

Main Methods:

  • Developed a two-compartment PK model using Pmetrics with two datasets (680 patients).
  • Validated the model using three independent datasets (34 patients).
  • Integrated the model into BestDose and validated its predictive performance on an application dataset (115 patients).

Main Results:

  • The cefepime PK model incorporated weight and creatinine clearance (CrCl) as covariates.
  • The model demonstrated excellent predictive accuracy (R² > 0.98) with a median prediction bias of 4%.
  • An OID algorithm was developed, suggesting specific dosing regimens based on CrCl and weight.

Conclusions:

  • A robust and validated cefepime PK model suitable for clinical application was developed.
  • Integration into the BestDose precision dosing tool facilitates improved cefepime therapy.
  • The OID algorithm provides a basis for individualized cefepime dosing to optimize patient outcomes.