Related Experiment Video

Updated: May 15, 2025

Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses
11:17

Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses

Published on: August 30, 2018

12.8K

Population pharmacokinetics of linezolid among post-operative patients: Implications for dosing strategies

Annum Maha1, Mohsin Ali2, Hajira Bilal3

  • 1Institute of Pharmaceutical Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan.

Pakistan Journal of Pharmaceutical Sciences
|April 9, 2025
PubMed

Insights

This study found that kidney function significantly impacts linezolid antibiotic clearance in Pakistani patients. Renal status is a key factor for optimizing linezolid dosage to prevent adverse effects.

Area of Science:

  • Pharmacology
  • Infectious Diseases
  • Clinical Pharmacy

Background:

  • Linezolid is a crucial antibiotic for treating infections caused by resistant bacteria like MRSA and VRE.
  • Understanding factors affecting linezolid clearance is vital for effective patient treatment, especially in diverse populations.
  • Renal and hepatic routes contribute to linezolid elimination, necessitating investigation into specific patient groups.

Purpose of the Study:

  • To identify factors influencing linezolid clearance in Pakistani patients.
  • To develop a population pharmacokinetic (popPK) model for linezolid in this population.
  • To assess the impact of covariates on linezolid's pharmacokinetic parameters.

Main Methods:

  • A population pharmacokinetic (popPK) model was developed using NONMEM® software.
  • Data from 215 samples collected from 59 post-operative patients after a single linezolid dose were analyzed.
  • Stepwise covariate modeling was employed to identify significant factors affecting linezolid clearance (CL) and volume of distribution (Vd).

Main Results:

  • A one-compartment model best described the population pharmacokinetics of linezolid.
  • The estimated linezolid clearance (CL) was 3.72 L/h, and the volume of distribution (Vd) was 36.9 L.
  • Creatinine clearance (CRCL) was identified as a significant covariate influencing linezolid CL, with 36.5% interindividual variability.

Conclusions:

  • Linezolid clearance is significantly influenced by the patient's renal status.
  • Dose optimization of linezolid based on renal function is essential in Pakistani patients.
  • Adjusting linezolid dosage according to renal status may help prevent toxicity and adverse drug effects.

More Related Videos

A Robust Pneumonia Model in Immunocompetent Rodents to Evaluate Antibacterial Efficacy against S. pneumoniae, H. influenzae, K. pneumoniae, P. aeruginosa or A. baumannii09:17

A Robust Pneumonia Model in Immunocompetent Rodents to Evaluate Antibacterial Efficacy against S. pneumoniae, H. influenzae, K. pneumoniae, P. aeruginosa or A. baumannii

Published on: January 2, 2017

14.5K
A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials06:18

A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials

Published on: March 3, 2023

1.3K

Related Concept Videos

Nonlinear Pharmacokinetics: Overview01:19

Nonlinear Pharmacokinetics: Overview

Nonlinear or dose-dependent pharmacokinetics is a phenomenon that occurs when the pharmacokinetic parameters of certain drugs deviate from linear pharmacokinetics at higher doses. These drugs do not follow the expected first-order kinetics, where the rate of drug elimination is directly proportional to the drug concentration. Instead, they exhibit a nonlinear relationship, which can be attributed to several factors.
Nonlinearity can arise due to the saturation of plasma protein-binding or...
211
Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance01:23

Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance

The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
A study on guinea pigs examined the...
52
Nonlinear Pharmacokinetics: Role of Transporters01:27

Nonlinear Pharmacokinetics: Role of Transporters

A drug's nonlinear kinetics can be influenced by a diverse range of transporter proteins that serve as crucial players in drug distribution. These transporters, found within cells, can enhance or reduce local drug concentrations by facilitating the influx or efflux of drugs. For instance, the expression of xenobiotic transporters can be influenced by factors such as age and gender, potentially impacting the linearity of drug response.
Polymorphisms occurring in drug transporters can alter...
20
Nonlinear Pharmacokinetics: Causes of Nonlinearity01:22

Nonlinear Pharmacokinetics: Causes of Nonlinearity

Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
83
Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model01:13

Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model

Drugs administered through various routes can lead to nonlinear elimination, resulting in complex pharmacokinetic behaviors crucial to understanding efficacious drug dosing.
When a drug is administered through a constant intravenous infusion and eliminated via nonlinear pharmacokinetics, it follows zero-order input. For example, oral drugs undergo first-order absorption upon administration and are eliminated through nonlinear pharmacokinetics.
In the case of subcutaneously administered drugs,...
28
One-Compartment Open Model for IV Bolus Administration: General Considerations01:19

One-Compartment Open Model for IV Bolus Administration: General Considerations

The one-compartment model is a pharmacokinetic tool that models the body as a single, uniform compartment, facilitating the understanding of drug distribution and elimination. This model is particularly beneficial for intravenous (IV) bolus administration, where the drug rapidly circulates throughout the body.
The drug's presence in the body is defined by an equation representing the difference between the rates of drug entry and exit. Key parameters—elimination rate constant,...
125