Inhaled beta2-agonists open up (dilate) the airways that
lead to the lungs (bronchial tubes). This makes it easier to breathe. They are
sometimes used in
acute bronchitis to help coughing and wheezing.
"Fibrosis" is a term used to refer to scarring, so pulmonary fibrosis means scarring in the lungs. Pulmonary fibrosis can be caused by many conditions, including chronic inflammatory processes (like sarcoidosis or Wegener's granulomatosis), infections, environmental agents (asbestos, silica, exposure to certain gases), exposure to ionizing radiation (such as radiation therapy to treat tumors of the chest), chronic conditions (lupus, rheumatoid arthritis), and certain drugs, such as nitrofurantoin...