The long acting analgesic used in post operative pain is

.Bupivacaine (Marcaine): It has got prolonged action. It is a vasodilator also. Dose: 3 mg/kg. Epidural block: 0.5% Spinal 0.5% 3 ml.* An epidural catheter is placed in the space and fixed. 2% xylocaine with adrenaline or 0.5% bupivacaine is injected into the space to achieve anaesthesia up to the desired level. ref:SRB&;s manual of surgery,ed 3,pg no 1105