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Related Concept Videos

Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
Pharmacodynamic Models: Link Model and Systems Pharmacodynamic Model01:14

Pharmacodynamic Models: Link Model and Systems Pharmacodynamic Model

The link model is a fundamental pharmacokinetic-pharmacodynamic (PK–PD) approach to account for delayed drug responses when the observed effect does not immediately correlate with the drug's plasma concentration peak. This delay is mathematically addressed by introducing an effect compartment concentration, Ce, which is kinetically linked to the plasma concentration, Cp, via a first-order rate constant, ke0. The linkage allows for a more accurate prediction of drug effects over time. A higher...
Pharmacokinetic–Pharmacodynamic Relationship: Model Components01:14

Pharmacokinetic–Pharmacodynamic Relationship: Model Components

Pharmacokinetic-pharmacodynamic (PK–PD) modeling is essential in drug development and clinical pharmacology. It provides a quantitative framework to predict drug behavior and response over time. This approach integrates pharmacokinetics (PK), which describes the drug's absorption, distribution, metabolism, and excretion, with pharmacodynamics (PD), which characterizes the drug’s biological effects and mechanisms of action.The disposition kinetics of a drug determine its plasma...
Model Approaches for Pharmacokinetic Data: Physiological Models01:15

Model Approaches for Pharmacokinetic Data: Physiological Models

Physiological models in pharmacokinetics are instrumental in understanding the distribution and elimination of drugs within the body. These models describe the drug concentration within target organs, influenced by factors such as drug uptake, tissue volume, and blood flow. Drug uptake is governed by the partition coefficient, which signifies the drug concentration ratio in tissue to that in the blood. The blood flow rate to a specific tissue is expressed as Qt, and the rate of change in tissue...
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Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance

Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
A recent model describes pravastatin's hepatobiliary excretion, mediated...
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Pharmacokinetic Models: Overview

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Related Experiment Video

Updated: Jun 21, 2026

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers
18:57

Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

Published on: October 17, 2013

[Study on pharmacokinetics model for targeted drug delivery systems].

Lingbing Li1, Pei Wei, Junyi Liu

  • 1Department of Pharmaceutics, Shandong University, Jinan 250012, China. cnlbli@sdu.edu.cn

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi = Journal of Biomedical Engineering = Shengwu Yixue Gongchengxue Zazhi
|July 29, 2009
PubMed
Summary

A new mathematical model predicts drug concentration over time in target organs for improved drug delivery systems. This model accurately forecasts drug levels using blood data, aiding pharmacokinetic analysis.

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Use of Rabbit Eyes in Pharmacokinetic Studies of Intraocular Drugs
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Area of Science:

  • Pharmacokinetics
  • Mathematical Modeling
  • Drug Delivery Systems

Context:

  • Accurate prediction of drug concentration in target organs is crucial for effective drug delivery.
  • Existing models may lack precision in forecasting in vivo drug behavior.
  • Compartment theory and mass conservation principles offer a foundation for modeling drug dynamics.

Purpose:

  • To establish a multi-compartment linear circulation mathematical model for targeted drug delivery.
  • To derive function formulas for drug concentration-time profiles in blood and target organs.
  • To validate the model's practicability using experimental data.

Summary:

  • A mathematical model based on compartment theory and mass conservation was developed for targeted drug delivery.
  • The model establishes drug concentration-time functions for blood and target organs, enabling prediction of organ concentration curves from blood data.
  • Pharmacokinetic parameters for the target organ can be calculated using statistical moments from the predicted concentration-time curve.
  • Model predictions for drug concentration-time curves in blood and target organs were validated against experimental data from microsphere studies, showing strong agreement.

Impact:

  • Provides a reliable mathematical tool for predicting drug concentration in target organs.
  • Facilitates the optimization of targeted drug delivery systems through accurate pharmacokinetic analysis.
  • Enables better understanding and design of drug delivery strategies by correlating blood and target organ drug levels.