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Related Concept Videos

Drug Concentrations: Measurements01:23

Drug Concentrations: Measurements

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Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
Plasma...
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Drug Concentration Versus Time Correlation01:15

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The plasma drug concentration-time curve is a crucial tool in pharmacokinetics, representing the drug's concentration in plasma at different time intervals post-administration. This curve illustrates the drug's journey from absorption into the systemic circulation, distribution to body tissues, and eventual elimination through excretion or biotransformation.
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Factors Affecting Protein-Drug Binding: Protein-Related Factors01:20

Factors Affecting Protein-Drug Binding: Protein-Related Factors

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Drug binding to proteins is a key aspect of pharmacokinetics and can influence a drug's distribution, absorption, and elimination in the body. Several factors, including the drug's physiochemical properties, protein concentration, disease states, and the number of binding sites on the protein, influence this process.
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Time Course of Drug Effect01:14

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The progression of a drug's impact can be analyzed by examining both the concentration-time course and the effect-time course. The concentration-time course is determined by the drug's half-life and is influenced by factors such as its pharmacokinetics, including absorption, distribution, metabolism, and elimination. The effect of the drug is often related to its concentration in the plasma and is calculated using the maximum drug effect and the plasma concentration that generates 50...
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Physiological Pharmacokinetic Models: Assumption with Protein Binding01:13

Physiological Pharmacokinetic Models: Assumption with Protein Binding

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Physiological models with protein binding in pharmacokinetics offer a sophisticated approach to understanding drug disposition. These models consider drug-protein interactions, enabling them to effectively predict drug concentrations in different organs and tissues. This precision aids in accurate drug dosing, providing a significant advantage over conventional models. A key process within these models is equilibration, which ensures that drug concentrations achieve a steady state within the...
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Pharmacokinetic–Pharmacodynamic Relationship: Problems01:24

Pharmacokinetic–Pharmacodynamic Relationship: Problems

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The empirical approach to drug therapy optimization relies on correlating pharmacological response with administered dosage. Such an approach can be costly, time-consuming, and often yields poor correlation due to variables like formulation factors and drug elimination characteristics. A more precise approach correlates response with plasma drug concentration or the amount of drug in the body, rather than dosage. This is achieved through pharmacokinetic-pharmacodynamic (PK/PD) modeling, which...
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Related Experiment Video

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Autoradiography as a Simple and Powerful Method for Visualization and Characterization of Pharmacological Targets
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Drug concentration, binding, and effect in vivo.

N H Holford1

  • 1Department of Pharmacology and Clinical Pharmacology, University of Auckland, New Zealand.

Pharmaceutical Research
|November 27, 2013
PubMed
Summary
This summary is machine-generated.

Drug effects depend on concentration at the action site. Measuring target tissue binding allows precise prediction of drug actions and interactions using binding properties and mass action law.

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Area of Science:

  • Pharmacodynamics
  • Pharmacokinetics
  • Drug Discovery

Background:

  • Drug effects are fundamentally linked to drug concentration at the site of action.
  • Empirical models often describe this relationship, but direct measurement of target tissue binding offers deeper insights.
  • Understanding drug-receptor interactions is key to predicting pharmacological responses.

Purpose of the Study:

  • To explore the detailed description of drug effects through direct measurement of target tissue binding.
  • To predict drug action and interaction based on binding properties and the law of mass action.
  • To model the time course of drug effects considering disposition, equilibration, and downstream signaling.

Main Methods:

  • Measuring drug binding to target tissues.
  • Applying the law of mass action to predict drug-receptor interactions.
  • Developing kinetic models that integrate drug disposition, blood-to-site equilibration, and effect signaling.

Main Results:

  • Direct measurement of binding provides a more detailed understanding of drug concentration-effect relationships.
  • Binding properties and mass action law enable prediction of drug actions at identifiable receptor sites.
  • Developed models successfully describe the kinetics of pharmacological response in various situations.

Conclusions:

  • Drug concentration at the site of action is the primary determinant of drug effects.
  • Quantifying drug-target binding kinetics enhances the predictive power of pharmacodynamic models.
  • Integrated kinetic models offer a comprehensive framework for understanding the time course of drug effects.