Anaesthesia All India exam 084749cf Concentration of adrenaline used with local anaesthetic A 1:1,000 B 1:10,000 C 1:1,00000 D 1:2,00000 High-Yield Explanation Concentration of adrenaline used for local anaesthetic is 1 in 2 lakhs, (that of phenylephrine is 1 in 20,000).