Comparison of inhaled budesonide with oral prednisolone at two dose-levels commonly used for the treatment of moderate asthma.

The purpose of the study was to compare the anti-asthmatic efficacy of two doses of inhaled budesonide with two doses of oral prednisolone commonly used in clinical practice. The patients studied had not been taking regular inhaled glucocorticosteroids and so there was minimal interference from previous medication. The study was conducted as two double-blind crossovers with a washout period between them - firstly, comparing 400 micrograms budesonide with 5 mg prednisolone per day and secondly, 800 micrograms budesonide with 10 mg prednisolone per day. Lung function and symptoms were improved significantly from run-in by all treatments and improvement on both drugs was dose-dependent. When low-dose treatments were compared, mean morning peak expiratory flow rate was higher during budesonide treatment and, as a result, diurnal variation was significantly less than that during prednisolone treatment. At the higher doses, differences between the drugs were not observed, but this may have been due to the fact that a "ceiling effect" had been reached.