Cis atracurium is preferred over atracurium due to advantage of –
Most important advantage of cisatracurium is that it does not provoke histamine release, therefore it is preferred over atracurium.
Onset of action is similar for both atracurium and cisatracurium, and cis-atracurim has longer duration of action.
Rapid onset
Short duration of action
No histamine release
Less cardiodepressant