Q: Succinylcholine and Rocuronium are the 2 most commonly used neuro-muscular blockades during intubation in ICUs. In which category of patients, Rocuronium should be use with precaution?

Answer: Asthma

There is considerable risk of allergic reaction to the drug group, non-depolarizing neuromuscular blocking drugs - particularly Rocuronium in some patients with asthma.  

Reference:  Burburan SM, Xisto DG, Rocco PR (June 2007). "Anaesthetic management in asthma". Minerva Anestesiologica 73 (6): 357–65.