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Related Concept Videos

Bioavailability Enhancement: Determination and Conceptual Approaches in Overcoming Bioavailability Problems01:22

Bioavailability Enhancement: Determination and Conceptual Approaches in Overcoming Bioavailability Problems

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Body:Bioavailability is a critical pharmacological concept that measures the extent and rate at which an active drug ingredient or therapeutic moiety enters the systemic circulation, remaining unchanged. It's a pivotal factor in determining a drug's efficacy and safety.The Biopharmaceutics Classification System (BCS) plays an essential role in drug development by categorizing drugs into four classes based on their solubility and permeability. This classification aids in understanding drug...
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Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

Bioavailability Study Design: Single Versus Multiple Dose Studies

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Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
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Pharmacokinetic Models: Comparison and Selection Criterion01:26

Pharmacokinetic Models: Comparison and Selection Criterion

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Physiological and compartmental models are valuable tools used in studying biological systems. These models rely on differential equations to maintain mass balance within the system, ensuring an accurate representation of the dynamic processes at play.
Physiological models take a detailed approach by considering specific molecular processes. They can predict drug distribution, metabolism, and elimination changes, providing a comprehensive understanding of how drugs interact with the body.
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Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance01:07

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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,...
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Bioavailability: Influencing Factors01:22

Bioavailability: Influencing Factors

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Bioavailability refers to the extent and rate at which a drug reaches systemic circulation in its active form. Extent refers to the amount of the drug that makes it into circulation, while rate is the speed at which it enters circulation. It is influenced by several factors critical for optimizing drug formulations, dosing regimens, and therapeutic outcomes.Physicochemical properties of drugs and formulationsThe solubility, stability, and dissolution rate of a drug significantly impact its...
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Measurement of Bioavailability: Pharmacodynamic Methods01:20

Measurement of Bioavailability: Pharmacodynamic Methods

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Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
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Dose Uptake of Platinum- and Ruthenium-based Compound Exposure in Zebrafish by Inductively Coupled Plasma Mass Spectrometry with Broader Applications
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Development of Empirical Bioavailability Models for Metals.

Kevin V Brix1, David K DeForest2, Lucinda Tear2

  • 1EcoTox, Miami, Florida, USA.

Environmental Toxicology and Chemistry
|December 28, 2019
PubMed
Summary

Empirical models effectively predict metal bioavailability for aquatic life. Recommendations focus on improving model development, data use, and statistical approaches for reliable environmental protection values.

Keywords:
BioavailabilityMetalModelMultilinear regressionWater quality criteria

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Area of Science:

  • Environmental chemistry
  • Ecotoxicology
  • Aquatic toxicology

Background:

  • Renewed interest in empirical models for metal bioavailability prediction.
  • Variability exists in conceptual and statistical approaches for model development.

Purpose of the Study:

  • Review case studies of empirical bioavailability model development.
  • Provide recommendations on key issues in model development.
  • Evaluate and suggest improvements for predicting metal bioavailability.

Main Methods:

  • Review of empirical bioavailability model development case studies.
  • Evaluation of species selection, toxicity-modifying factors (TMFs), and data set utilization.
  • Analysis of statistical considerations for model derivation and normalization.

Main Results:

  • Recommends identifying TMFs using speciation, toxicity data, and statistical analysis.
  • Advocates for robust experimental designs covering 90% of TMF range.
  • Suggests rigorous evaluation of data fit using visual and statistical methods.

Conclusions:

  • Empirical models offer comparable predictive power to mechanistic models.
  • These models provide a transparent tool for environmental management of metal bioavailability.
  • Pooled models are recommended over taxa-specific models when data permit.