We are looking for volunteers to take part in a clinical research study, called the RPL554-CO-301 study, which can help us learn more about an investigational medication for Chronic Obstructive Pulmonary
Disease (COPD). COPD is a group of lung diseases, including emphysema and chronic bronchitis. This study is looking at how safe the investigational medication is and whether it works for people with moderate-to-severe COPD. The study will help us learn whether the investigational medication is able to improve your breathing and reduce symptoms by decreasing swelling and widening the airways of the lungs in a single medication.