<prompt> Which of the following is a long-acting beta 2 agonistOrciprenalinePenoterolPexbaterolSalmeterol  <response>: β2-agonists used in Asthma.Short-acting Salbutamol, terbutalineLong-acting Salmeterol, formoterol Bambuterol is a prodrug of terbutaline.It is slowly hydrolysed by pseudocholinesterase. Short-acting β2-agonists produce bronchodilation within 5 min and acting lasts for 2-6 hrs are used to abort and terminate acute asthma, but are not suitable for prophylaxis. Salmeterol is delayed acting, can be used for prophylaxis only, while formoterol is fast acting and long acting can be used for both prophylaxis and acute attack.Salbutamol Terbutaline Only for acute attack. Salmeterol Only for prophylaxis. Formoterol Both for prophylaxis and acute attack Long-acting β2-agonists.salmeterol formoterol are superior to short-acting β2-agonists salbutamol terbutaline, and equivalent to inhaled anticholinergics in COPD. Note: For one option go ahead with option d, i.e., adrenaline because amongst the given options, adrenaline is the shortest acting 60 - 90 minutes. Salmeterol and formoterol are long-acting β2,-agonists. Their lipophilic action is responsible for longer action Lipophilic side chain anchors the drug in membrane adjacent to the receptor, slowing issue washout. 