<prompt> Shortest acting NDMR:SuccinylcholineMivacuriumAtracuriumPancuronium  <response>: Ans. is b i.e. Mivacurium Note-Rapacuronium onset is 15-20 minsMillers anesthesia 5ep 892, Drugs and equipment in Anaesthesia 5ep 78 Arm Kumar Paul Among the given options Rapacuronium is the shortest acting drug. Rapacuronium has been withdrawn from the market because it produces intense bronchospasm in a significant number of patients. Alcuronium is a relatively short-acting muscle relaxant. Always remember this Shortest acting competitive non depolarizing neuromuscular blocker - Mivacurium duration of action 12-18 minutes Fastest acting non-depolarizing blocker Rocuronium Shortest and fastest acting neuromuscular blocker overall - Succinylcholine Longest acting neuromuscular blocker - Pancuronium Histamine release is caused by Doxacurium - d-TC maximum tendency, Succinylcholine, Mivacurium, Virtually no hist amic release - Pancuronium Maximal vagal block and Tachycardia - Pancuronium Vagal stimulation is caused by - Succinylcholine Maximal ganglion blockade is caused by - d-TC Ganglion stimulation is caused by - Succinylcholine Most commonly used muscle relaxant for - Vecuronium routine surgery Most potent skeletal muscle relaxant - Doxacurium Least potent skeletal muscle relaxant - Succinylcholine Least potent non-depolarizing skeletal muscle - Rocuronium relaxant 