<prompt> Arrange the following drugs according to their half life in increasing order1. Amiodarone2. Adenosine3. Esmolol4. Omeprazole2, 3, 4, 12, 3, 1, 43, 2, 4, 12, 4, 2, 1  <response>: Ans. AExplanation: Amiodarone is longest acting anti-arrhythmic drug. Its half life is more than 3 weeks. Adenosine is shortest acting anti-arrhythmic drug having half life less than 10 seconds. Esmolol is an ultra short acting beta blocker. It is metabolized by pseudocholinesterase and thus has half life less than 5 minutes. Omeprazole has half life of 1 -2 hours but works for 24 hours due to irreversible inhibition of proton pump. Thus, the sequence isAdenosine Esmolol Omeprazole Amiodarone 