<prompt> The long acting analgesic used in post operative pain isBupivacaneDubivacineMorphineTramadol  <response>: .Bupivacaine Marcaine: It has got prolonged action. It is a vasodilator also. Dose: 3 mgkg. 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 