Succinylcholine Rocuronium Chemical structure Structurally two acetyl choline molecules joined together Aminosteroid Classification Depolarising neuromuscular blocker Non-depolarising neuromuscular blocker Fasciculation Yes (causes post-op myalgia) No Metabolism Rapidly metabolised by pseudocholinesterase Duration of action prolonged in Pseudocholinesterase deficiency Eliminated primarily by liver and slightly by kidney Elimination half life longer as compared to Sch. Dosage Used for intubation only now-a-days 1-1.5 mg/kg iv 4-5 mg/kg im (onset delayed) Used for both intubation as well as during maintenance Intubation: 0.6-1.2mg /kg iv Intubation: 1mg/kg im (infants) and 2mg/kg im (children)  onset delayed (3-6min) Maintenance: 0.15 mg/kg every 20 mins Continuous infusion: 5-12µg/kg/min Onset of action after iv induction dose (onset to maximum twitch depression) 30-60secs 60-90 secs…