Mezlocillin sodium and sulbactam sodium are penicillium broad-spectrum antibiotics, which are highly sensitive to gram-positive bacteria, gram-negative cocci and actinomycetes, such as staphylococcus, streptococcus and diplococcus; It is also sensitive to Corynebacterium diphtheriae, Bacillus anthracis, Clostridium odontoides, Actinomyces bovis, Streptobacillus moniliformis, Listeria monocytogenes, Treponema pallidum, Leptospira, Neisseria gonorrhoeae and Diplococcus meningitidis; And it is effective against drug-resistant Staphylococcus aureus.