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Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
Factors Affecting Drug Response: Overview01:21

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When it comes to infants and young children, they are typically administered smaller doses of medication in comparison to adults. This is primarily because their organ functions still need to fully develop, meaning their bodies are not as efficient at metabolizing or eliminating drugs. Additionally, their blood-brain barrier is more permeable than in adults. As a result, high concentrations of drugs can easily penetrate the central nervous system (CNS), potentially leading to neurological...
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Pharmacodynamics is the scientific study of a drug's biochemical or physiological influence on the body. It categorizes responses into continuous, discrete (or categorical), and time-to-event outcomes. Continuous responses yield numerical values within a certain range, such as blood pressure readings and blood glucose levels, gauging the efficacy of antihypertensive and antidiabetic drugs. Discrete responses can be binary, indicating whether a drug has an effect or not, or ordinal, exemplifying...
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu01:29

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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...
Factors Affecting Drug Biotransformation: Biological01:19

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Biological factors significantly impact drug metabolism, influencing drug clearance, efficacy, and potential toxicity.
Species differences: Variations in enzyme systems across species can cause disparities in drug metabolism. For instance, humans may metabolize certain drugs faster than rodents, altering therapeutic effects.
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Drug Dosing: Geriatric Patients01:15

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Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...

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Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
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Gender differences in pharmacological response.

Gail D Anderson1

  • 1Health Science Complex H-361A, University of Washington, Seatle, Washington 98195, USA.

International Review of Neurobiology
|October 22, 2008
PubMed
Summary
This summary is machine-generated.

Female sex increases adverse drug reaction risk due to pharmacokinetic and pharmacodynamic differences. Factors like body composition, drug metabolism via cytochrome P450 (CYP) enzymes, and renal clearance impact drug safety.

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Area of Science:

  • Pharmacology
  • Clinical Pharmacology
  • Drug Safety

Background:

  • Female sex is a known risk factor for adverse drug reactions (ADRs).
  • Potential causes include sex-based differences in pharmacokinetics, pharmacodynamics, and dosing practices.

Purpose of the Study:

  • To explore the pharmacokinetic and pharmacodynamic factors contributing to increased ADR risk in females.
  • To identify specific drug-metabolizing enzymes and physiological differences involved.

Main Methods:

  • Review of recent studies on sex differences in drug disposition and effects.
  • Analysis of pharmacokinetic parameters like volume of distribution (Vd) and clearance (Cl).
  • Examination of pharmacodynamic responses and specific ADRs reported more frequently in females.

Main Results:

  • Females exhibit different body composition (higher body fat) and lower glomerular filtration rates, affecting Vd and renal clearance.
  • Sex-based variations exist in cytochrome P450 (CYP) and uridine diphosphate glucuronosyltransferase (UGT) enzyme activity, influencing drug metabolism.
  • Females show a higher incidence of drug-induced long QT syndrome, liver toxicity, NSAID-related gastrointestinal events, and allergic skin rashes.

Conclusions:

  • Sex differences in pharmacokinetics and pharmacodynamics significantly contribute to ADR risk in females.
  • Consideration of size, age, and comorbidities is crucial for optimizing drug regimens in both sexes.
  • Further research is essential to fully understand and address these sex-based disparities in clinical pharmacology.