Dataset from A Randomised, Double-Blind, Placebo-Controlled, Crossover Efficacy and Safety Evaluation of 8-Week Treatment Periods of Two Doses [5 Mcg (2 Actuations of 2.5 Mcg) and 10 Mcg (2 Actuations of 5 Mcg)] of Tiotropium Inhalation Solution Delivered by the Respimat Inhaler® as Add-on Therapy in Patients With Severe Persistent Asthma

The primary objective of this study is to examine efficacy and safety of tiotropium compared to plac ebo as add-on therapy in severe asthmatics according to GINA step 4 classification