In a group of 12 patients suffering from reversible airways obstruction, lung function data and serum levels were studied before and after rectal application of a combination of methyl-xanthines (400 mh theophylline, 600 mg diprophylline, 600 mg proxyphylline). The follow-up over a period of 10 hours showed an immediate bronchodilator effect of the mixture within 30 minutes to 1 hour; bronchodilation was still detectable after an interval of 10 hours. The improvement in lung function correlated with the serum levels. No side effects were noted after rectal administration of the drugs.
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