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Related Concept Videos

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Dosage Regimen: Individualization

Individualization in dosing regimens is the customization of medication doses for individual patients. Its necessity arises from the goal of maximizing therapeutic benefits while minimizing risks. This approach is pivotal because human responses to drugs can vary widely; what is effective for one person may be inadequate or excessive for another. Interpatient (intersubject) variability refers to differences in drug responses between individuals, while intrapatient (intrasubject) variability...
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Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...
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The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
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Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...
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Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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An Intestine/Liver Microphysiological System for Drug Pharmacokinetic and Toxicological Assessment
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Published on: December 3, 2020

Gender and interindividual variability in pharmacokinetics.

Jean-Marie Nicolas1, Pascal Espie, Mathieu Molimard

  • 1UCB Pharma SA, Chemin du Foriest, Braine I' Alleud, B-1420 Belgium. Jean-Marie.Nicolas@UCB.com

Drug Metabolism Reviews
|July 16, 2009
PubMed
Summary
This summary is machine-generated.

Antiallergic drug effectiveness varies greatly between individuals. Factors like gender, genetics, and diet significantly impact how these medications are processed, affecting therapeutic outcomes and side effect risks.

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Area of Science:

  • Pharmacology
  • Allergy Treatment

Background:

  • Antiallergic medications, particularly H1 antihistamines, exhibit significant inter- and intraindividual variability in disposition.
  • This variability can lead to unpredictable therapeutic responses, including increased side effects and subtherapeutic dosing.

Purpose of the Study:

  • To review the primary factors contributing to pharmacokinetic variability in antiallergic drugs.
  • To emphasize the roles of gender differences, genetic polymorphism, and food habits in this variability.

Main Methods:

  • Literature review focusing on pharmacokinetic studies of antiallergic medications.
  • Analysis of factors influencing drug disposition and variability.

Main Results:

  • H1 antihistamines serve as well-documented examples of variable drug disposition.
  • Gender, genetic makeup, and dietary habits are identified as key contributors to pharmacokinetic variability.

Conclusions:

  • Understanding interindividual variability is crucial for optimizing antiallergic drug therapy.
  • Addressing factors like gender, genetics, and diet can help personalize treatment and improve patient outcomes.