AB Phylline N Tablet is a combination of two medicines that helps the airways in your lungs stay open. It works by relaxing the muscles of these airways. This makes it easier for air to get in and out. This medicine also loosens thick mucus, making it easier to cough 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. AB Phylline N Tablet usually starts to work within a few minutes and the effects can last up to several hours. Take it as prescribed by the doctor. Do not stop using it unless you are advised to by your doctor.