Testing two different doses of tiotropium Respimat® in cystic fibrosis: phase 2 randomized trial results

PLoS One. 2014 Sep 4;9(9):e106195. doi: 10.1371/journal.pone.0106195. eCollection 2014.


Background: Tiotropium is a once-daily, long-acting anticholinergic bronchodilator with the potential to alleviate airway obstruction in cystic fibrosis. Our objective was to evaluate the efficacy and safety of 2.5 and 5 µg once-daily tiotropium delivered via the Respimat Soft Mist Inhaler vs. placebo in people with cystic fibrosis.

Methods: This phase 2, 12-week, randomized, double-blind, placebo-controlled parallel-group study of tiotropium Respimat as add-on to usual cystic fibrosis maintenance therapy included people with cystic fibrosis with pre-bronchodilator forced expiratory volume in 1 second (FEV1) ≥ 25% predicted. Co-primary efficacy end points were change from baseline in percent-predicted FEV1 area under the curve from 0 to 4 hours (FEV1 AUC0-4h), and trough FEV1 at the end of week 12.

Findings: A total of 510 subjects with cystic fibrosis aged 5-69 years were randomized. Both doses of tiotropium resulted in significant improvement compared with placebo in the co-primary efficacy end points at the end of week 12 (change from baseline in percent-predicted FEV1 AUC0-4h: 2.5 µg: 2.94%, 95% confidence interval 1.19-4.70, p = 0.001; 5 µg: 3.39%, 95% confidence interval 1.67-5.12, p = 0.0001; in percent-predicted trough FEV1 ∶ 2.5 µg: 2.24%, p = 0.2; 5 µg: 2.22%, p = 0.02). There was a greater benefit with tiotropium 5 vs. 2.5 µg. No treatment-related adverse events or unexpected safety findings were observed in patients taking tiotropium.

Conclusions: Tiotropium significantly improved lung function in people with cystic fibrosis. The improvement was greater with the higher dose than the lower dose, with no difference in adverse events.

Trial registration: ClinicalTrials.gov NCT00737100 EudraCT 2008-001156-43.

Publication types

  • Clinical Trial, Phase II
  • Randomized Controlled Trial

MeSH terms

  • Administration, Inhalation
  • Adolescent
  • Adult
  • Child
  • Cystic Fibrosis / drug therapy*
  • Double-Blind Method
  • Female
  • Forced Expiratory Volume
  • Humans
  • Male
  • Respiratory Function Tests
  • Scopolamine Derivatives / administration & dosage
  • Scopolamine Derivatives / adverse effects
  • Scopolamine Derivatives / therapeutic use*
  • Tiotropium Bromide
  • Young Adult


  • Scopolamine Derivatives
  • Tiotropium Bromide

Associated data

  • EudraCT/2008-001156-43
  • ClinicalTrials.gov/NCT00737100

Grants and funding

This study was funded by Boehringer Ingelheim. Boehringer Ingelheim was involved in the study design, data collection and analysis, decision to publish, and preparation of the manuscript.