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Related Concept Videos

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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Factors Influencing Bioavailability: First-Pass Elimination01:23

Factors Influencing Bioavailability: First-Pass Elimination

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When a drug is taken orally, it undergoes a journey starting from the gastrointestinal (GI) tract, passing through the portal vein, reaching the liver, and finally entering the systemic circulation. This process involves the absorption of the drug across the GI tract. The liver is the primary site for metabolizing the drug, with some metabolism also occurring in the gut wall. This journey significantly reduces the quantity of the drug that reaches the systemic circulation, a phenomenon known as...
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Bioavailability: Overview01:17

Bioavailability: Overview

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Bioavailability refers to the proportion of an administered drug that reaches the systemic circulation in its active, unaltered form. It is a crucial pharmacokinetic parameter that determines the effectiveness of a drug in achieving its intended therapeutic outcomes. The route of administration significantly influences bioavailability, with intravenous administration achieving 100% bioavailability as the drug directly enters the bloodstream. In contrast, oral administration often results in...
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Bioavailability: Overview01:13

Bioavailability: Overview

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Bioavailability refers to the proportion of an unaltered drug that, after administration, enters the systemic circulation and can be distributed to the desired action site. Factors such as gastrointestinal (GI) absorption and liver biotransformation influence the bioavailability of a drug when it is administered orally. When a drug is administered intravenously, it enters the systemic circulation directly; by definition, its bioavailability is assumed to be 100%. The bioavailability of an...
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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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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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An In Vivo Method for Evaluating the Gut-Blood Barrier and Liver Metabolism of Microbiota Products
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[Bioavailability and factors influencing its rate].

Barbora Vraníková, Jan Gajdziok

    Ceska a Slovenska Farmacie : Casopis Ceske Farmaceuticke Spolecnosti a Slovenske Farmaceuticke Spolecnosti
    |June 19, 2015
    PubMed
    Summary

    This study explores factors influencing oral drug bioavailability, focusing on absorption rates. Understanding these elements is key to improving drug efficacy and delivery.

    Keywords:
    bioavailability drug solubility poorly soluble drugs factors influencing bioavailability.

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    Area of Science:

    • Pharmacology
    • Pharmaceutics
    • Drug Delivery

    Background:

    • Bioavailability, the rate and extent of drug absorption, is crucial for therapeutic efficacy.
    • Oral drug bioavailability is influenced by drug properties, physiology, dosage form, and patient variability.
    • This article initiates a series on bioavailability and enhancement methods.

    Purpose of the Study:

    • To provide a comprehensive overview of factors affecting oral drug bioavailability.
    • To identify key aspects influencing the rate of active ingredient absorption after oral administration.
    • To lay the groundwork for subsequent articles detailing bioavailability improvement strategies.

    Main Methods:

    • Literature review and synthesis of existing knowledge on drug bioavailability.
    • Analysis of factors impacting drug absorption from the gastrointestinal tract.
    • Overview of physicochemical, physiological, and formulation-related influences.

    Main Results:

    • Identified key factors affecting oral bioavailability: drug physicochemical properties, physiological conditions, dosage form, food, biorhythms, and patient variability.
    • Highlighted the complexity of drug absorption and systemic availability.
    • Summarized various influences on the rate of bioavailability.

    Conclusions:

    • Understanding the multifaceted factors influencing oral bioavailability is essential for optimizing drug therapy.
    • This overview serves as a foundation for exploring specific methods to enhance drug bioavailability.
    • Further research and detailed strategies will be presented in subsequent publications.