RecruitingPhase 3Drug trialA Study to Compare Safety of 4 Weeks Exposure to Propellants Hydrofluoroalkane 1,1-difluoroethane (HFA-152a) and HFA-1,1,1,2-tetrafluoroethane (134a)This study aims to generate additional safety data on the propellant component of the reformulated product by comparing metered dose inhaler (MDIs) containing HFA-152a (test) with HFA-134a (reference).