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: Anaesthesia
Drug used to prolong action of LA in Hypertensive pts – 
Select and explain. 
A. Clonidine, B. Felypressin, C. Dexmeditomidate, D. Noradrenalin
B: Felypressin
Answer: B: Felypressin 
Explanation: Vasoconstrictor are used along with local anaesthetics.
Adrenaline is the most commonly used vasoconstrictor. Less commonly phenylephrine is also used. Felypressin (synthetic vasopressine) does not effect BP & HR → Preferred in patients with cardiovascular disease.