<prompt> Fastest acting nondepolarizing neuromuscular blocker-RocuroniumPancuroniumSuccinylcholineMivacurium  <response>: Rocuronium has onset of action at 1mgkg 90 seconds Rocuroniumis the muscle relaxant of choice for day-care surgery. intermediate-acting muscle relaxant with a rapid onset 90 s. Rapacuronium has onset of action 75 secs but it is not in clinical use. Rest all nondepolarising neuromuscular blocker has onset of action - 3-5 minutes 