<prompt> Cis-Atracurium is preferred over Atracurium becauseIt has rapid onset of actionIt causes realse of histamineIt has sho duration of actionIt has less depressant action on hea  <response>: Refer Millers 7e p 869 Both Atracurium and cis-Atracurium are non-depolarizing neuromuscular blockers Both of these are intermediate acting agents Both of these agents are cardiostable 