Albuterol 90mcg/inh; metered-dose aerosol ... Increased cyclic AMP levels cause relaxation of bronchial smooth muscle. Prime before using for the first time, when the inhaler has not been used ...

At the end of the study, propellant loss in the Proventil HFA test MDIs increased threefold over that in the controls. The Ventolin HFA test MDIs also had an increased leak rate compared with ...

and Ventolin HFA (GlaxoSmithKline, Research Triangle Park, NC). These products contain albuterol as an active ingredient and use hydrofluoroalkane propellants instead of chlorofluorocarbon.