FDA Approves Boehringer Ingelheim’s STIOLTO™ RESPIMAT® Inhalation Spray as Once-Daily Maintenance Treatment for COPD FDA Approves Boehringer Ingelheim’s STIOLTO™ RESPIMAT® Inhalation Spray as Once-Daily Maintenance Treatment for COPD FDA Approves Boehringer Ingelheim’s STIOLTO™ RESPIMAT® Inhalation Spray as Once-Daily Maintenance Treatment for COPD