Study on the Safety and Efficacy of PA9159 Inhalation Aerosol for the Treatment of Adult Bronchial Asthma

This study is testing a new inhaled aerosol medication called PA9159 for the treatment of asthma in adults. It is looking at whether this drug is safe and effective at improving lung function and controlling asthma symptoms. **You may be eligible if...** - You are 18–75 years old - You have been diagnosed with asthma (either newly or as a childhood diagnosis that has worsened in adulthood) - Your lung function test shows moderate impairment (FEV1 60–85% of predicted) - You have a positive bronchodilator response (your breathing improves significantly after inhaling a rescue inhaler) or a positive bronchial challenge test **You may NOT be eligible if...** - You are unable to use an inhaler or nebulizer correctly - You have another lung condition such as COPD, bronchiectasis, or pulmonary fibrosis - You are pregnant or breastfeeding - You have other serious health conditions that the investigator determines make participation unsafe Talk to your doctor to see if this trial is right for you.