<prompt> Cis atracurium is preferred over atracurium due to advantage ofRapid onsetSho duration of actionNo histamine releaseLess cardiodepressant  <response>: Cisatracurium is preferred over atracurium as it does not release histamine. Onset of action is same for both atracurium and cisatracurium. Cis-atracurium has longer duration of action. 