Explanation Doxacuronium is the longest acting neuromuscular blocking agent.Duration of action is 120 minutes Atracuronium duration of action: 45 minutes Vecuronium duration of action: 25-40 minutes Pancuronium duration of action: 85-100 minutes Most potent skeletal muscle relaxant: Doxacuronium Least potent skeletal muscle relaxant: Succinylcholine Least potent non depolarizing muscle relaxant: Rocuronium Most commonly used muscle relaxant for routine surgery: Vecuronium 4.2K viewsEneutron Info, 15:00