Doxofylline is a medication commonly used to treat chronic obstructive pulmonary disease (COPD) and asthma. It is a bronchodilator that works by relaxing the muscles around the airways in the lungs, making it easier to breathe. Doxofylline helps to prevent and treat wheezing and shortness of breath caused by asthma or other lung conditions. It is typically taken in tablet form and may be used in combination with other treatments like inhaled steroids. The drug belongs to a class of medications called xanthine derivatives, which improve airflow and reduce the frequency and severity of respiratory symptoms.