This is a randomized, cumulative dose, open-label, 2-period crossover, multi-center study to assess the safety, efficacy, PK, and extrapulmonary pharmacodynamics (PD) of cumulative doses of Albuterol Sulfate Pressurized Inhalation Suspension (hereafter referred to as AS MDI) compared to cumulative doses of Proventil® hydrofluoroalkane (HFA; hereafter referred to as Proventil) as an active control in subjects with mild to moderate asthma.