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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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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 absorption...
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Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

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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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Bioavailability Enhancement: Drug Permeability Enhancement01:27

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After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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Bioavailability Enhancement: Drug Solubility Enhancement01:16

Bioavailability Enhancement: Drug Solubility Enhancement

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Bioavailability is a critical factor in determining a drug's effectiveness. It refers to the proportion of a drug that enters the circulation when introduced into the body and is, as a result, able to have an active effect. Enhancing bioavailability is essential for drugs with poor solubility, as it can significantly impact their therapeutic efficacy. Various methods are employed to increase the solubility of drugs, thereby enhancing their bioavailability.Micronization and nanonization are...
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Oral Drug Delivery Systems: Introduction01:23

Oral Drug Delivery Systems: Introduction

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Oral drug delivery is the most common route of administration due to its convenience, cost-effectiveness, and high patient compliance. It enables precise formulation to ensure proper drug dosage and bioavailability. The development of oral dosage forms considers drug properties such as solubility, stability, and absorption to optimize therapeutic efficacy.Tablets, capsules, liquids, and chewable formulations enhance drug stability, mask undesirable tastes, and improve patient experience.
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Modified-Release Drug Delivery Systems: Bioavailability01:30

Modified-Release Drug Delivery Systems: Bioavailability

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Modified-release (MR) dosage forms are designed to extend drug release over time, thereby maintaining stable plasma concentrations and reducing dosing frequency. However, their bioavailability is typically below 100% due to incomplete drug release and presystemic metabolism, and limitations in drug permeability across the gastrointestinal epithelium, all of which can restrict the fraction of the drug reaching systemic circulation. Consequently, studying the in vivo bioavailability of MR...
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Optimizing Oral Bioavailability in Drug Discovery: An Overview of Design and Testing Strategies and Formulation

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Area of Science:

  • Pharmacology
  • Drug Discovery
  • Pharmaceutical Sciences

Background:

  • Achieving adequate systemic exposure from orally administered drugs is essential for therapeutic efficacy.
  • Drug discovery teams face significant challenges in optimizing oral bioavailability for new therapeutic agents.

Purpose of the Study:

  • To summarize current challenges in oral bioavailability during drug discovery.
  • To outline design, testing methods, and strategies for addressing these challenges.
  • To provide guidelines for optimizing oral bioavailability in drug discovery programs.

Main Methods:

  • Compounds are profiled for solubility, permeability, and first-pass metabolism.
  • Computational assessments and high-throughput in vitro assays are used to predict absorption.
  • Pharmacokinetic studies, including evaluation of dosing vehicles and formulations, are critical decision points.

Main Results:

  • Solubility, permeability, and first-pass metabolism are key contributors to poor oral bioavailability.
  • Dosing vehicles and bioavailability-enabling formulations significantly impact oral absorption, particularly for poorly soluble compounds.
  • Identifying the rate-limiting barrier to bioavailability is essential for optimization.

Conclusions:

  • A systematic approach involving profiling, in vitro/in vivo studies, and formulation strategies is necessary.
  • Understanding and overcoming bioavailability limitations are critical for successful oral drug development.
  • Strategic consideration of formulation and vehicle selection can enhance oral bioavailability.