<prompt> Mechanism of action of Salmeterol is:Pure b2 agonistPure b1 agonistb1 b2 agonistal agonist  <response>: 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. 