The effect of hydrocortisone on plasma theophylline concentrations was evaluated in 20 patients suffering from chronic bronchitis or stable bronchial asthma. Choline theophyllinate (400 mg) was orally administered every 12 h for 8 days and blood samples were taken every 2 h during the day for the measurement of theophylline concentrations. Intravenous bolus injections of 500 or 1000 mg hydrocortisone on day 5 or day 7, respectively, did not significantly alter plasma theophylline concentrations.
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