Mechanism of action of Theophylline in bronchial asthma: (A) Phosphodiestesrase 4 inhibition, (B) Beta 2 agonism, (C) Antichoinergic action, (D) Inhibition of mucociliary clearance
Answer is A. Refer Katzung 11/e p 345 Theophylline is used in bronchial asthma. It's mechanise of action is Inhibition of phosphodiestesrase paicularly PDE-4 Antagonism of adenosine receptors Enhancement for histone deacetylation