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Related Experiment Videos

A large-sample study of diazepam pharmacokinetics.

D J Greenblatt1, J S Harmatz, H Friedman

  • 1Department of Psychiatry, Tufts University School of Medicine, Boston, Massachusetts.

Therapeutic Drug Monitoring
|November 1, 1989
PubMed
Summary

This study found that oral diazepam pharmacokinetics, including elimination half-life and clearance, show significant variability in healthy adults. Understanding these individual differences is crucial for accurate dosing and treatment outcomes.

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Clinical pharmacology and therapeutics·1992

Area of Science:

  • Pharmacology
  • Clinical Pharmacy

Background:

  • Diazepam is a widely prescribed benzodiazepine.
  • Understanding its pharmacokinetic variability is essential for safe and effective therapeutic use.

Purpose of the Study:

  • To investigate the pharmacokinetic variability of oral diazepam in healthy male volunteers.
  • To analyze the distribution of key pharmacokinetic parameters after a single oral dose.

Main Methods:

  • 48 healthy male volunteers (aged 18-44) received a single 10-mg oral dose of diazepam.
  • Plasma concentrations of diazepam and desmethyldiazepam were measured over 11 days.
  • Statistical analysis of pharmacokinetic parameters including peak plasma concentration, elimination half-life, elimination rate constant, clearance, and volume of distribution.

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Main Results:

  • Peak plasma concentration distribution was normal.
  • Distributions for elimination half-life, elimination rate constant, clearance, and volume of distribution were significantly skewed and non-normal.
  • Logarithmic transformation normalized distributions for elimination rate constant, half-life, and volume of distribution, but not time to peak concentration.

Conclusions:

  • Oral diazepam exhibits high pharmacokinetic variability even in a homogeneous population.
  • Accurate pharmacokinetic forecasting and statistical testing may benefit from better characterization of these underlying distributions.