<prompt> Which of the following drug is a long-acting beta-2 agonistAlbuterolSalmeterolPirbuterolOrciprenaline  <response>: ref; KD Tripathi Pharmacology 7th editionpage no;223 Salmeterol is the first long-acting selective beta 2 agonist with a slow onset of action; used by inhalation on a twice-daily schedule for maintenance therapy and for nocturnal asthma, but not for acute symptoms. salbutamol can be used for acute symptoms 