However, oxygen is expensive with the cost per patient running into several hundred dollars per month, depending on the type of system and on the locale. They are sometimes used if airway obstruction cannot be kept under control with bronchodilators, and lung function is shown to improve on this therapy. Inhaled steroids given regularly may be of benefit in some patients and have few side effects. They are frequently given at the first sign of a respiratory infection such as increased sputum production with a change in color of sputum from clear to yellow or green. Expectorants help loosen and expel mucus secretions from the airways.
Diuretics help the body excrete excess fluid.
They are given as therapy to avoid excess water retention associated with right-heart failure. Patients taking diuretics are monitored carefully because dehydration must be avoided. These drugs also may cause potassium imbalances which can lead to abnormal heart rhythms. It is used very cautiously in patients who have COPD, especially if their blood oxygen tensions are low, because they are vulnerable to abnormal heart rhythms when taking this drug. A number of combination drugs containing various assortments of sympathomimetics, methylxanthines, expectorants, and sedatives are marketed and widely advertised.