Step-down treatment from medium-dosage of budesonide/formoterol in controlled asthma

Background: The stepping down of asthma treatment can be considered when asthma symptoms have been well controlled with inhaled corticosteroids (ICSs)/long-acting beta 2 adrenergic agonists (LABAs). However, few data are available comparing the efficacy between two step-down strategies, to reduce ICS/LABA dose or to withdraw LABA continuing ICS, in well-controlled asthmatics. Methods: This, was a prospective multicentre randomized, two-arm, controlled study. Ninety-one asthmatic patients controlled by budesonide/formoterol combination (BFC) 320/9 mu g twice daily were assigned to 2 stepping-down treatments as follows: the BFC group; BUD/FM 160/4.5 mu g twice daily, and the ICS group; ICS (budesonide 400 mu g twice daily or equivalent dose of ICS) without LABA, and followed for 12 weeks. The primary outcome was the incidence of asthma exacerbations. Asthma control, pulmonary function tests, and fraction of exhaled nitric oxide (FeNO) were evaluated at the beginning and end of the period. Results: The incidence of exacerbations was 163% in the BFC groups and 12.5% in the ICS group, which were not different between the groups (p = 0.766). No significant differences were found in QOL score and FeNO between 0 week and 12 week in the both group. FEV1 and FEV1 percentage of the predicted value were lower at week 12 than at week 0 in the ICS group, but not in the BFC group. Conclusions: The two step-down strategies for 12 weeks have equal acceptability in well-controlled asthmatics treated with medium-dose of BFC, however, withdrawal of LABA may have potential risk to deteriorate FEV1. Clinical trial registration: This study was registered to UMIN-LIK. (http://www.umin.ac.jp/ctr/), UMIN000010333. (C) 2016 Elsevier Ltd. All rights reserved.