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Related Experiment Videos

Compliant populations: variability in serum concentrations.

N M Graves1, G B Holmes, I E Leppik

  • 1College of Pharmacy, University of Minnesota, Minneapolis 55455.

Epilepsy Research. Supplement
|January 1, 1988
PubMed
Summary
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This study analyzed serum concentrations of phenytoin and carbamazepine in compliant patients. Results show minimal variability, suggesting stable drug levels under ideal conditions for epilepsy drug trials.

Area of Science:

  • Pharmacology
  • Clinical Pharmacy
  • Neuroscience

Background:

  • Antiepileptic drug (AED) trials require precise dosing for accurate safety and efficacy assessments.
  • Patient adherence significantly impacts serum drug concentrations, a factor often challenging to control in real-world settings.

Purpose of the Study:

  • To quantify serum concentration variability of phenytoin (PHT) and carbamazepine (CBZ) in motivated, compliant patients during clinical trials.
  • To establish baseline variability data for these AEDs under ideal adherence conditions.

Main Methods:

  • Serum concentrations of PHT and CBZ were analyzed from two safety and efficacy trials.
  • Evaluated parameters included coefficient of variation, difference from baseline, and percent difference in drug concentrations.

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Main Results:

  • Phenytoin's coefficient of variation was typically under 20% and unaffected by baseline levels or dosing frequency.
  • Carbamazepine's coefficient of variation was generally below 25%, with no correlation to serum concentration or administration frequency.
  • Most PHT concentrations varied by <5 µg/ml from baseline and <30% from each other; CBZ varied by <2 µg/ml and <40%.

Conclusions:

  • Compliant patients exhibit low variability in serum concentrations of phenytoin and carbamazepine.
  • These findings provide benchmarks for drug concentration fluctuations in AED trials and ideal patient management.
  • The data can inform the selection of appropriate therapeutic ranges and monitoring strategies for AEDs.