Study to Assess the Efficacy and Safety of Budesonide (PT008) in Adult Subjects With Mild to Moderate Persistent Asthma

This is a randomized, double-blind, chronic dosing (4 weeks), four-period, five-treatment, incomplete block, cross-over, multicenter study to assess the efficacy and safety of four doses of budesonide inhalation aerosol (BD MDI, PT008) relative to placebo MDI in adult subjects with mild to moderate persistent asthma.