2. Management, Allocation and Prophylaxis Those with esophageal variceal bleeding receive edoscopic variceal ligation; those with gastric variceal bleeding receive Histoacryl injection therapy. They all recieve glypressin 1mg q6h injection for 3 days and start to feed on the second day if not contraindicated. We will perform 2nd session of endoscopic treatment 14 days later. These patients will randomly alloacted to 2 groups and recieve prophylactic antibiotic after 1st endoscopic treatment; Group I: ceftriaxone 500 mg iv bolus stat and then q12h for 3 days, Group II: ceftriaxone 500 mg iv bolus stat and then q12h for 7 days. If rebleeding occurs after allocation, further treatment was decided by attending physician. If active infection occurs during prophylaxis period and no improvement was observed for 24 hours, ceftriaxone use will be stopped and further treatment was decided by attending physician.