Ampicillin is a semi-synthetic broad-spectrum penicillin, its Antibacterial mechanism is to prevent the synthesis of bacterial cell wall, so it can not only inhibit its proliferation, but also directly kill bacteria. The effect of gram-positive bacteria and penicillin is similar, the effect of streptococcus and enterococcus is better, the effect of other bacteria is worse, to penicillin resistant staphylococcus aureus ineffective. Among gram-negative bacteria, neisseria gonorrhoeae, meningococcus, influenza bacillus, pertussis bacillus, Escherichia coli, typhoid and paratyphoid bacillus, dysentery bacillus, Proteus mirabilis, Brucella are sensitive to this product, but easy to produce drug resistance. Pneumoniae, indole positive proteus and pseudomonas aeruginosa are not sensitive to this product.

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