Posted: July 22nd, 2017

A female client with chronic obstructive pulmonary disease (COPD) takes anhydrous theophylline, 200 mg P.O. every 8 hours. During a routine clinic visit, the client asks the nurse how the drug works. What is the mechanism of action of anhydrous theophylline in treating a nonreversible obstructive airway disease such as COPD?

A female client with chronic obstructive pulmonary disease (COPD) takes anhydrous theophylline, 200 mg P.O. every 8 hours. During a routine clinic visit, the client asks the nurse how the drug works. What is the mechanism of action of anhydrous theophylline in treating a nonreversible obstructive airway disease such as COPD?

A. It makes the central respiratory center more sensitive to carbon dioxide and stimulates the respiratory drive.
B. It inhibits the enzyme phosphodiesterase, decreasing degradation of cyclic adenosine monophosphate, a bronchodilator.
C. It stimulates adenosine receptors, causing bronchodilation.
D. It alters diaphragm movement, increasing chest expansion and enhancing the lung’s capacity for gas exchange.

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