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Apparent decrease in population clearance of theophylline: implications for dosage

M J Asmus1, M M Weinberger, G Milavetz

  • 1Division of Clinical and Administrative Pharmacy, College of Pharmacy, University of Iowa, Iowa City, USA.

Clinical Pharmacology and Therapeutics
|December 9, 1997
PubMed
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Theophylline dosage requirements for asthma patients have significantly decreased, with current doses being 25% lower than previously observed. This indicates a potential shift in theophylline clearance within the population.

Area of Science:

  • Pharmacology
  • Pulmonology
  • Clinical Pharmacy

Background:

  • Theophylline dosing recommendations were based on historical data.
  • Recent observations suggested lower theophylline dose requirements in asthma patients.

Purpose of the Study:

  • To investigate the hypothesis of a downward shift in theophylline dose requirements for asthma patients.
  • To compare current theophylline dosage needs with historical data.

Main Methods:

  • Retrospective analysis of theophylline dosage requirements in asthma patients from two clinics (Iowa and Florida).
  • Comparison of dosage data from 1990-1995 with historical data from 1978-1983.
  • Dosage requirements were assessed to achieve peak serum concentrations of 10-20 micrograms/ml.

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Main Results:

  • Mean theophylline dosage requirements were approximately 25% lower in the recent study period (1990-1995) compared to the historical period (1978-1983).
  • Similar mean peak serum theophylline concentrations (14 micrograms/ml) were maintained across both periods.
  • No significant differences in mean dosage requirements were found between the Iowa and Florida patient cohorts.

Conclusions:

  • Theophylline dose requirements to achieve target serum concentrations have significantly decreased.
  • This decrease suggests a potential reduction in the mean clearance of theophylline in the patient population.
  • Current theophylline dosing recommendations may need revision based on these findings.