Influence of theophylline on gastro-oesophageal reflux and asthma.

The aim of the study was to determine whether gastro-oesophageal (GO)-reflux was increased by normal maintenance doses of theophylline, and if so, whether this was detrimental to lung function in asthmatic patients with symptoms of reflux. In 25 patients with moderate or severe bronchial asthma and a history of respiratory symptoms aggravated by reflux, two consecutive oesophageal 24-h pH recordings were made, one with and the other without their ordinary dose of slow release theophylline. The theophylline treatment caused a significant increase in total reflux time and reflux symptoms but did not worsen the asthma. Patients with subtherapeutic serum levels showed significant improvement in lung function and those with therapeutic serum levels did not. It is concluded that theophylline, in view of its potential to exacerbate GO-reflux, should be used with caution as maintenance therapy in asthmatic patients with GO-reflux.