Theophylline is a bronchodilator used to treat asthma, chronic bronchitis, and other respiratory conditions by relaxing the ...

Anti-inflammatory effects are seen with serum theophylline levels <10 mg/l. A higher range of 10–20 mg/l is necessary for bronchodilator effects, but toxic adverse effects become apparent.

Background: In contrast to asthma, the indication for bronchodilators prior to bronchoscopy in patients with COPD has not been properly investigated. We therefore performed a randomized ...