Ampicillin-sulbactam is suitable for hepatobiliary system, urinary system, skin and soft tissue infections caused by β-lactamase-producing Haemophilus influenzae, Moraxella catarrhalis, Neisseria gonorrhoeae, Staphylococcus, certain Escherichia coli, Klebsiella, Proteus mirabilis, Bacteroides fragilis, Acinetobacter, Enterococcus, etc. It is particularly suitable for mixed infections of aerobic and anaerobic bacteria, especially abdominal and pelvic infections. This product is also effective for the above-mentioned infections caused by ampicillin-sensitive bacteria. This product should not be used for infections caused by Pseudomonas aeruginosa, Citrobacter, Providencia, Enterobacter, Morganella and Serratia.