<prompt> Drug used to prolong action of LA in Hypertensive ptsClonidineFelypressinDexmeditomidateNoradrenalin  <response>: 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. 