Prophylactic antibiotics have been routinely recommended for cirrhotic patients with upper gastrointestinal bleeding recently. However, the regimen and duration of its use remain an inconclusive issue. Quinolones and 3rd generation cephalosporins have been more often used for prophyalxis recently. The duration for antibiotic usage were variable in the literatures, ranged from 4-10 days. The latest guideline from AASLD in 2007 was 7 days. In the survey of infections in cirrhotic patients with UGI bleeding performed by Bernard et al, most infections occurred in the first 5 days and half within the first 48 hours. Therefore, considering the cost-effectiveness and drug resistance issues, the necessity for such prophylaxis for 7 days may need to be re-evaluated.