Inhaled Treprostinil for Dyspnea and Exercise Intolerance in Mild COPD

This study is testing whether inhaled treprostinil — a drug currently used for a different lung condition — can relieve breathlessness and improve exercise tolerance in people with mild chronic obstructive pulmonary disease (COPD). **You may be eligible if...** - You have been diagnosed with mild COPD based on lung function tests (FEV1/FVC ratio below 0.70 and FEV1 of at least 80% predicted) - You experience shortness of breath or reduced ability to exercise - You have not been able to find adequate relief from standard COPD treatments **You may NOT be eligible if...** - You already have heart failure or pulmonary arterial hypertension - You have a known low platelet count (thrombocytopenia) - Your resting blood pressure is very low (below 90/50 mmHg) - You have a known sensitivity or allergy to prostanoid-type drugs - You have severe liver disease Talk to your doctor to see if this trial is right for you.