Piperacillin is a broad-spectrum penicillin antibiotic that kills bacteria primarily by interfering with the synthesis of bacterial cell walls. It is mainly used for infections caused by Pseudomonas aeruginosa and various Gram-negative bacilli, but it is easily hydrolyzed by β-lactamases produced by bacteria and develops drug resistance.

Sulbactam has no antibacterial activity against other bacteria except Neisseria and Acinetobacter, but it has an irreversible inhibitory effect on most important β-lactamases produced by β-lactam antibiotic-resistant strains. Sulbactam can prevent the destruction of penicillins and cephalosporins by resistant bacteria and has a significant synergistic effect with penicillins and cephalosporins.

Penicillin has good antibacterial effect on Streptococcus such as hemolytic Streptococcus, Streptococcus pneumoniae and Staphylococcus that does not produce penicillinase. It has moderate antibacterial effect on enterococci, and Neisseria gonorrhoeae, Neisseria meningitidis, Corynebacterium diphtheriae, Bacillus anthracis, Actinomyces bovis, Streptobacillus candida, Listeria monocytogenes, Leptospira and Treponema pallidum are sensitive to this product. This product also has certain antibacterial activity against Haemophilus influenzae and Bordetella pertussis, and other Gram-negative aerobic or facultative anaerobic bacteria are less sensitive to this product. This product has good antibacterial effect on Clostridium, Peptostreptococcus anaerobic bacteria and melanin-producing Bacteroides, but has poor antibacterial effect on Bacteroides fragilis. Penicillin exerts its bactericidal effect by inhibiting bacterial cell wall synthesis.

Penicillin has good antibacterial effect on Streptococcus such as hemolytic Streptococcus, Streptococcus pneumoniae and Staphylococcus that does not produce penicillinase. It has moderate antibacterial effect on enterococci, and Neisseria gonorrhoeae, Neisseria meningitidis, Corynebacterium diphtheriae, Bacillus anthracis, Actinomyces bovis, Streptobacillus candida, Listeria monocytogenes, Leptospira and Treponema pallidum are sensitive to this product. This product also has certain antibacterial activity against Haemophilus influenzae and Bordetella pertussis, and other Gram-negative aerobic or facultative anaerobic bacteria are less sensitive to this product. This product has good antibacterial effect on Clostridium, Peptostreptococcus anaerobic bacteria and melanin-producing Bacteroides, but has poor antibacterial effect on Bacteroides fragilis. Penicillin exerts its bactericidal effect by inhibiting bacterial cell wall synthesis.

This product is a semi-synthetic β-lactamase inhibitor, which has strong antibacterial activity against Neisseria gonorrhoeae, Neisseria meningitidis and Acinetobacter calcoaceticus, and has poor effects on other bacteria, but has strong irreversible competitive inhibition of β-lactamase produced by Staphylococcus aureus and most Gram-negative bacteria. When used in combination with penicillins and cephalosporins, it can reduce the MIC of Staphylococcus aureus, Haemophilus influenzae, Escherichia coli, Bacteroides fragilis, etc., which are resistant to the first two types of antibiotics due to enzyme production, to within the sensitive range. This product has a strong affinity for PBP1 of Bacillus mirabilis and PBP2 of Acinetobacter calcoaceticus.

This product is a semi-synthetic β-lactamase inhibitor, which has strong antibacterial activity against Neisseria gonorrhoeae, Neisseria meningitidis and Acinetobacter calcoaceticus, and has poor effects on other bacteria, but has strong irreversible competitive inhibition of β-lactamase produced by Staphylococcus aureus and most Gram-negative bacteria. When used in combination with penicillins and cephalosporins, it can reduce the MIC of Staphylococcus aureus, Haemophilus influenzae, Escherichia coli, Bacteroides fragilis, etc., which are resistant to the first two types of antibiotics due to enzyme production, to within the sensitive range. This product has a strong affinity for PBP1 of Bacillus mirabilis and PBP2 of Acinetobacter calcoaceticus.