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Related Experiment Videos

The theophylline-erythromycin interaction.

M J Rieder1, M Spino

  • 1Division of Clinical Pharmacology, Hospital for Sick Children, Toronto, Ontario, Canada.

The Journal of Asthma : Official Journal of the Association for the Care of Asthma
|January 1, 1988
PubMed
Summary
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Concurrent erythromycin and theophylline therapy can increase theophylline levels, potentially causing toxicity in up to 25% of patients. Careful monitoring of serum theophylline concentrations is crucial during this drug interaction.

Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Drug Interactions

Background:

  • The interaction between erythromycin and theophylline has been a subject of interest and debate since 1976.
  • Numerous studies have investigated this interaction using various research designs.

Purpose of the Study:

  • To evaluate the clinical significance of the drug interaction between erythromycin and theophylline.
  • To determine the impact of concurrent therapy on theophylline clearance and serum concentrations.

Main Methods:

  • Analysis of studies simulating clinical settings with 7- to 10-day concurrent theophylline and erythromycin therapy.
  • Monitoring of serum theophylline concentrations in patients receiving combined treatment.

Main Results:

Related Experiment Videos

  • Concurrent therapy can lead to variable changes in theophylline clearance.
  • Approximately 25% of patients may experience elevated serum theophylline concentrations, risking toxicity, particularly those with levels at the upper therapeutic range.
  • Mean increases in serum theophylline concentrations may reach 25%, with potential for greater increases in some individuals.

Conclusions:

  • Careful monitoring of serum theophylline concentrations is essential when initiating erythromycin in patients on theophylline therapy to prevent toxicity.
  • Other macrolide antibiotics may also interact with theophylline due to cytochrome P-450 isoenzyme complexation.
  • Understanding this interaction is critical for primary care and chest physicians, especially with the emergence of new macrolides and the role of mycoplasma in asthma.