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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...
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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...
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Related Experiment Video

Updated: Jul 14, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
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[Sex differences in pharmacology].

Kim Brøsen1

  • 1Syddansk Universitet, Institut for Sundhedstjenesteforskning, Klinisk Farmakologi, Odense C. kbrosen@health.sdu.dk

Ugeskrift for Laeger
|June 28, 2007
PubMed
Summary

Women report 30% more adverse drug reactions than men, potentially due to pharmacokinetic and pharmacodynamic sex differences. Further research is needed to understand these variations and improve drug safety for all.

Area of Science:

  • Pharmacology
  • Pharmacoepidemiology
  • Drug Safety

Background:

  • Pharmacoepidemiological studies indicate women report approximately 30% more adverse drug reactions (ADRs) than men.
  • The underlying reasons for this sex disparity in ADRs remain largely unknown.
  • Potential factors include differences in drug usage, polypharmacy, reporting thresholds, or true sex-based variations in drug metabolism and response.

Purpose of the Study:

  • To explore potential sex differences in pharmacokinetics and pharmacodynamics that may contribute to increased adverse drug reactions in women.
  • To investigate specific enzyme activities and drug metabolism pathways that differ between sexes.

Main Methods:

  • Review of existing pharmacoepidemiological data on adverse drug reaction reporting.

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  • Analysis of reported sex differences in drug metabolism, focusing on cytochrome P450 (CYP) enzyme activity (e.g., CYP3A4, CYP1A2) and glucuronidation.
  • Examination of pharmacodynamic sex differences, including drug-induced torsades de pointes incidence.

    • Main Results:

    • Sex differences in drug metabolism pathways have been observed, with increased CYP3A4 activity and decreased CYP1A2 activity in women compared to men.
    • Drug glucuronidation appears to be slower in women.
    • Drug-induced torsades de pointes occur twice as frequently in women.

    Conclusions:

    • True sex differences in pharmacokinetics and pharmacodynamics likely contribute to women's increased susceptibility to adverse drug reactions.
    • Understanding these sex-based variations is crucial for optimizing drug therapy and enhancing patient safety.
    • Further research into sex-specific drug effects is warranted.