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Bioavailability: Overview

Bioavailability: Overview

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...

Bioavailability: Overview

Bioavailability: Overview

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...

Modified-Release Drug Delivery Systems: Bioavailability

Modified-Release Drug Delivery Systems: Bioavailability

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...

Bioavailability Study Design: Absolute Versus Relative Bioavailability

Bioavailability Study Design: Absolute Versus Relative Bioavailability

Bioavailability is a crucial pharmacokinetic parameter that quantifies the proportion of an administered drug that reaches the systemic circulation and is available for therapeutic action. Regulatory agencies mandate the assessment of bioavailability, typically measured as the area under the drug plasma concentration-versus-time curve (AUC), to ensure the efficacy and safety of pharmaceutical products. These evaluations are categorized as absolute and relative bioavailability studies.Absolute...

Bioavailability: Influencing Factors

Bioavailability: Influencing Factors

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...

Measurement of Bioavailability: Pharmacodynamic Methods

Measurement of Bioavailability: Pharmacodynamic Methods

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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Related Experiment Video

Updated: Jun 5, 2026

Real-time Analyses of Retinol Transport by the Membrane Receptor of Plasma Retinol Binding Protein

Real-time Analyses of Retinol Transport by the Membrane Receptor of Plasma Retinol Binding Protein

Published on: January 28, 2013

Bioavailability of resveratrol.

¹Department of Pharmacology, Medical University of South Carolina, Charleston, 29425, USA. wallet@musc.edu

Annals of the New York Academy of Sciences

|January 26, 2011

Summary

Resveratrol absorption in humans is high, but extensive metabolism significantly reduces oral bioavailability to less than 1%. Colonic bacteria and specific enzymes may influence resveratrol

Area of Science:

Pharmacokinetics
Nutraceutical Science
Human Metabolism

Background:

Resveratrol, a polyphenol found in grapes and berries, is recognized for its potential health benefits.
Understanding its absorption, distribution, metabolism, and excretion (ADME) is crucial for therapeutic applications.

Purpose of the Study:

To review the current knowledge on resveratrol's absorption, bioavailability, and metabolism in humans.
To identify key metabolic pathways and factors influencing its efficacy.

Main Methods:

Review of existing literature on resveratrol pharmacokinetics and metabolism.
Analysis of human studies focusing on oral absorption, plasma/urine metabolite identification, and bioavailability.

Main Results:

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Oral absorption of resveratrol in humans is approximately 75%, primarily via transepithelial diffusion.
Extensive first-pass metabolism in the intestine and liver leads to an oral bioavailability below 1%.
Major metabolites include glucuronides and sulfates, with significant contributions from reduced dihydroresveratrol and unknown polar products.

Conclusions:

Despite high initial absorption, resveratrol's oral bioavailability is severely limited by rapid metabolism in the gut and liver.
Colonic bacterial metabolism and deconjugation enzymes may play a more significant role than previously assumed.
Future research should explore resveratrol analogs with enhanced bioavailability, such as methylated derivatives.