Asthma is one of those illnesses that is so common that we never stop to question what causes it and how it could be treated. Affecting more than 25 million people, asthma is one of the most common chronic respiratory conditions in the United States. It is caused by the increased reactivity of the tracheobronchial tree to various stimuli, including exercise, allergies, or infections of the respiratory tract. Symptoms include, but are not limited to breathlessness, cough, wheezing, and chest tightness.


The most commonly used medications for asthma are: bronchodilators, xanthine derivatives, leukotriene inhibitors, corticosteroids, and mast cell stabilizers (see full list below). Xanthine derivatives treat asthma by re ...