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Related Concept Videos

Bioavailability Study Design: Absolute Versus Relative Bioavailability01:27

Bioavailability Study Design: Absolute Versus Relative Bioavailability

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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...
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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

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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

198
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...
198
Bioavailability: Influencing Factors01:22

Bioavailability: Influencing Factors

352
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: Pharmacokinetic Methods01:30

Measurement of Bioavailability: Pharmacokinetic Methods

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Pharmacokinetics is a vital branch of pharmacology that examines how drugs are absorbed, distributed, metabolized, and excreted by the body. Two key methodologies in pharmacokinetics are plasma drug concentration studies and urinary drug excretion analyses, both of which provide critical insights into a drug's therapeutic efficacy and bioavailability.Plasma Drug Concentration-Time StudiesPlasma drug concentration-time studies involve analyzing blood samples at specific intervals to quantify...
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The Caco-2 Cell Bioassay for Measurement of Food Iron Bioavailability
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Magnesium Bioavailability and Tolerability Do Not Differ between Two Supplements with Different Release Properties.

Theresa Greupner1, Inga Schneider1, Sandra Gellert1

  • 1Institute of Food Science and Human Nutrition, Leibniz University Hannover, Hannover, Germany.

Journal of Dietary Supplements
|June 25, 2019
PubMed
Summary
This summary is machine-generated.

Two magnesium (Mg2+) supplements with different release profiles showed comparable bioavailability and excellent tolerability. Both are suitable for increasing magnesium intake without significant gastrointestinal side effects.

Keywords:
bioavailabilitygeneral nutritionmagnesiumsupplementtolerability

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Area of Science:

  • Nutritional Science
  • Pharmacokinetics
  • Human Physiology

Background:

  • Magnesium (Mg2+) is a widely supplemented micronutrient.
  • Upper intake levels for Mg2+ supplements are established due to potential gastrointestinal side effects.
  • Limited systematic data exists on the tolerability of Mg2+ supplements.

Purpose of the Study:

  • To directly compare the bioavailability and tolerability of two 500 mg Mg2+ supplements.
  • To evaluate supplements with direct release versus delayed release properties.
  • To assess Mg2+ absorption and side effects under controlled conditions.

Main Methods:

  • A crossover study with duplicate determination and one-week washout periods was employed.
  • Participants received 500 mg Mg2+ supplements after overnight fasting.
  • Serum Mg2+ levels were monitored for 8 hours, and 24-hour urine was collected.

Main Results:

  • No significant differences were observed in 24-hour renal Mg2+ excretion or serum Mg2+ area under the curve between the two products.
  • Both magnesium supplements were well-tolerated, with a low incidence of gastrointestinal adverse effects.
  • Mg2+ bioavailability did not differ significantly between the direct and delayed-release formulations.

Conclusions:

  • The bioavailability of the tested magnesium supplements did not differ.
  • Both magnesium supplements demonstrated good tolerability with minimal side effects.
  • These supplements are suitable for enhancing magnesium supply without significant adverse effects.