Mechanism of action of Salmeterol is:

Ans. is 'a' i.e., Pure b2 agonist Salmeterol* It is the first long acting p2 agonist with slow onset of action used by inhalation on a twice daily schedule for maintenance therapy, but not for acute asthma.* Concurrent use of inhaled salmeterol and inhaled glucocorticoids produces effects equivalent to double dose of corticosteroid alone.