Duphill AM tablet is used to treat Chronic obstructive pulmonary disease (COPD). Duphill AM 400mg/30mg Tablet SR helps the airways in your lungs stay open. It relaxes the muscles of these airways. This makes it easier for air to get in and out. It will relieve symptoms such as tightness in your chest, shortness of breath, wheezing and coughing and help you carry out your daily activities more easily. This medicine is safe and effective. It usually starts to work within a few minutes and the effects can last up to several hours. Do not stop using it unless you are advised to by your doctor.