In two 12-week, randomized, double-blind, placebo-controlled studies of identical design (Study 1 and Study 2), ProAir Respiclick (153 patients) was compared to a matched placebo dry powder inhaler (163 patients) in asthmatic patients 12 to 76 years of age at a dose of 180 mcg albuterol four times daily. Patients were maintained on inhaled corticosteroid treatment. Serial FEV1 measurements, shown below in Figure 1 as average of the mean changes from test-day baseline at Day 1 and Day 85, demonstrated that two inhalations of ProAir Respiclick produced significantly greater improvement in FEV1 AUC0‑6hr over the pre-treatment value than placebo in Study 1. Consistent results were observed in Study 2.