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Theophylline-ranitidine interaction in elderly COPD patients

A Cukier1, F S Vargas, S R Santos

  • 1Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|August 1, 1995
PubMed
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Ranitidine did not alter theophylline metabolism in elderly COPD patients. The study found no significant changes in theophylline clearance rates when ranitidine was co-administered, refuting slower metabolism as a cause of toxicity.

Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Geriatrics

Background:

  • Controlled studies suggest ranitidine does not affect theophylline metabolism.
  • Recent case reports indicate theophylline toxicity in older patients co-administered with ranitidine.
  • The mechanism behind potential theophylline toxicity with ranitidine in elderly patients remains unclear.

Purpose of the Study:

  • To investigate the effect of ranitidine on theophylline pharmacokinetics in elderly patients with chronic obstructive pulmonary disease (COPD).
  • To determine if ranitidine alters theophylline metabolism or clearance in this specific patient population.

Main Methods:

  • Eleven elderly COPD patients received slow-release theophylline alone for one week, followed by theophylline plus ranitidine for one week.

Related Experiment Videos

  • Serum theophylline levels were measured at multiple time points over 12 hours after the morning dose during each treatment period.
  • Theophylline clearance rates and time to peak concentration (Tmax) were analyzed.

    • Main Results:

    • The time to peak theophylline concentration (Tmax) was significantly shorter when ranitidine was co-administered (2.9 h vs 4.1 h, P < 0.01).
    • Mean theophylline clearance rates were similar between the theophylline-alone and theophylline-plus-ranitidine phases (39.58 ml/min vs 34.42 ml/min).
    • Mean serum theophylline levels were not statistically different between the two treatment phases.

    Conclusions:

    • The observed increases in serum theophylline levels in some elderly patients receiving ranitidine are not due to slower theophylline metabolism.
    • Ranitidine co-administration may affect the rate of theophylline absorption rather than its metabolic clearance in geriatric COPD patients.
    • Further research is needed to elucidate the exact mechanism of potential theophylline toxicity when combined with ranitidine in the elderly.