Lung function improvement, tremor measurements and c-AMP determinations in a group of ten patients with asthmatic bronchitis after one week sustained release theophylline medication (theophylline plasma level +/- 10 mg/l) compared to one week placebo.

After one week theophylline therapy with a sustained release preparation (TheoDur 200 and 300 mg), a mean theophylline level of 10 mg/l was obtained in a group of ten patients with chronic asthmatic bronchitis with a mean dosage of 760 mg theophylline/24 h. A good improvement of the lung function was achieved, although only statistically significant for the mid maximal expiratory flow rate (MMEF) and the end expiratory specific airway conductance (sGaw) compared to placebo therapy. Tremor measurements and cyclic-AMP determinations showed a slight increase after theophylline therapy compared to placebo, although not statistically significant.