Doxofylline is an effective medication used in the treatment of asthma as well as of Chronic Obstructive Pulmonary Disease (COPD). It has a bronchodilator effect which reduces breathlessness in patients suffering from asthma. It helps relax the muscles in the bronchi and bronchioles, thus causing dilatation of the air passages and helping patients to breathe easily. The drug also possesses antitussive properties which help control the cough linked with lung disorders.