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Related Concept Videos

Pharmacokinetics: Overview01:10

Pharmacokinetics: Overview

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Pharmacokinetics is a scientific discipline that focuses on the journey of a drug within the body, encompassing four key stages: absorption, distribution, metabolism, and elimination. The first stage, absorption, involves the drug's transfer into the bloodstream. Several factors dictate the extent and speed of this process. For example, the liver often metabolizes oral drugs before they reach systemic circulation, leading to only partial absorption. In contrast, intravenous (IV)...
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Pharmacokinetic Models: Overview01:20

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Pharmacokinetic models utilize mathematical analysis to achieve a detailed quantitative understanding of a drug's life cycle within the body. They are instrumental in simulating a drug's pharmacokinetic parameters, predicting drug concentrations over time, optimizing dosage regimens, linking concentrations with pharmacologic activity, and estimating potential toxicity.
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Nonlinear Pharmacokinetics: Overview01:19

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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.
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Nonlinear Pharmacokinetics: Causes of Nonlinearity01:22

Nonlinear Pharmacokinetics: Causes of Nonlinearity

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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...
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Biopharmaceutics and Pharmacokinetics: Overview01:28

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Understanding drugs, drug products, and their performance in pharmaceutical science is pivotal. Drugs, whether simple molecules or complex compounds, are designed to interact with the body's biological systems to diagnose, treat, or prevent diseases. Drug products include various delivery systems such as tablets, capsules, injections, and inhalers. The performance of these drug products is gauged by their ability to deliver the active ingredient to the desired site of action at the...
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Cholinergic Antagonists: Pharmacokinetics01:24

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Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and...
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Updated: Jan 24, 2026

Use of Rabbit Eyes in Pharmacokinetic Studies of Intraocular Drugs
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Murine Pharmacokinetic Studies.

Alix F Leblanc1, Kevin M Huang1, Muhammad Erfan Uddin1

  • 1Division of Pharmaceutics and Pharmaceutical Chemistry, College of Pharmacy, The Ohio State University, Columbus, OH, USA.

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|May 21, 2019
PubMed
Summary
This summary is machine-generated.

This study presents a serial bleeding protocol for murine pharmacokinetics (PK) studies. The method reduces animal use and sample variation, yielding complete PK profiles efficiently.

Keywords:
BloodCardiac punctureOrbital venous plexusPharmacokineticPlasmaSubmandibular vein

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Area of Science:

  • Pharmacology
  • Drug Development
  • Preclinical Research

Background:

  • Murine pharmacokinetics (PK) is crucial for guiding clinical drug studies and ensuring effective treatments.
  • Traditional PK studies often require significant animal numbers and can lead to high sample variation.

Purpose of the Study:

  • To describe a novel serial bleeding protocol for obtaining comprehensive murine PK profiles.
  • To present a method that enhances efficiency and reduces variability in preclinical drug assessment.

Main Methods:

  • A serial bleeding protocol involving serial blood sampling from a single mouse at six distinct time points.
  • Detailed procedural steps for acquiring a complete PK profile from individual animals.

Main Results:

  • The protocol is rapid, highly repeatable, and easy to implement.
  • Demonstrated significant reduction in animal usage compared to conventional methods.
  • Showcased decreased sample variation by utilizing samples from the same animal.

Conclusions:

  • This serial bleeding protocol offers an efficient and reliable approach for murine PK analysis.
  • The method contributes to more ethical and cost-effective preclinical drug development by minimizing animal use and data variability.