All of the following statements regarding theophylline are true, except:
Theophylline is a methylxanthine, used in the treatment of bronchial asthma. Its dose has to be reduced in elderly (age > 60 years), in congestive hea failure, pneumonia and liver failure.
Increases cAMP
Inhibits phosphodiesterase
Increase in dose is required in smokers
Increase in dose is required in cardiopulmonary disease
Increase in dose is required in cardiopulmonary disease