This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Adrenaline is added to Lignocaine injection for: March 2007 
Select and explain. 
A. Less bleeding at the site, B. Higher doses can be given, C. Prolonged duration of action, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. D: All of the above Adrenaline is a local vasoconstrictor, so using adrenaline only with sho acting agents such as Lignocaine has advantages, like: Less bleeding at the site (local infiltration). Less systemic absorption, and consequently lower toxicity and possibility of giving a higher dose. Prolonged duration of action.