Penicillin has good antibacterial effect on hemolytic streptococci and other streptococci, Streptococcus pneumoniae and non-penicillinase-producing staphylococci. It has moderate antibacterial effect on enterococci. 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 penicillin antibiotic. It has antibacterial effects on Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, Proteus, Enterobacter, Citrobacter, Serratia, Acinetobacter, and Gram-positive cocci sensitive to penicillin. It has a bactericidal effect in large doses. Its antibacterial activity against Escherichia coli, Enterobacter, Klebsiella pneumoniae, Citrobacter, Serratia, and Acinetobacter is stronger than carbenicillin and ampicillin; its antibacterial activity against indole-positive Proteus and Pseudomonas aeruginosa is stronger than carbenicillin and sulbenicillin; its antibacterial activity against Gram-positive bacteria such as Staphylococcus aureus is similar to that of carbenicillin, and its antibacterial activity against Streptococcus faecalis is superior to that of carbenicillin and sulbenicillin. It has good antibacterial effect against most anaerobic bacteria such as Bacteroides fragilis.

This product is a semi-synthetic penicillin antibiotic. It has antibacterial effects on Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, Proteus, Enterobacter, Citrobacter, Serratia, Acinetobacter, and Gram-positive cocci sensitive to penicillin. It has a bactericidal effect in large doses. Its antibacterial activity against Escherichia coli, Enterobacter, Klebsiella pneumoniae, Citrobacter, Serratia, and Acinetobacter is stronger than carbenicillin and ampicillin; its antibacterial activity against indole-positive Proteus and Pseudomonas aeruginosa is stronger than carbenicillin and sulbenicillin; its antibacterial activity against Gram-positive bacteria such as Staphylococcus aureus is similar to that of carbenicillin, and its antibacterial activity against Streptococcus faecalis is superior to that of carbenicillin and sulbenicillin. It has good antibacterial effect against most anaerobic bacteria such as Bacteroides fragilis.