Tiotropium Respimat® add-on therapy to inhaled corticosteroids in patients with symptomatic asthma improves clinical outcomes regardless of baseline characteristics.

•Patient characteristics may impact responses to asthma treatment.•Tiotropium Respimat is an efficacious add-on to maintenance therapy for asthma.•Tiotropium improved FEV1 and asthma control irrespective of patient characteristics.•Once-daily add-on tiotropium Respimat is beneficial across different patient types.