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. 1979 Apr;15(4):540–543. doi: 10.1128/aac.15.4.540

Comparative In Vitro Activity of Azlocillin, Ampicillin, Mezlocillin, Piperacillin, and Ticarcillin, Alone and in Combination with an Aminoglycoside

G Wesley White 1, James B Malow 1, Victoria M Zimelis 1, Hossein Pahlavanzadeh 1,†, Anand P Panwalker 1, George Gee Jackson 1
PMCID: PMC352707  PMID: 111616

Abstract

The in vitro activities of the newer semisynthetic penicillins azlocillin, mezlocillin, and piperacillin were compared with those of ampicillin and ticarcillin by using 290 clinical laboratory isolates. Piperacillin and mezlocillin were the most active against Escherichia coli, Proteus mirabilis, Klebsiella spp., and Enterobacter spp. When Pseudomonas aeruginosa was tested, piperacillin and azlocillin were more active than either mezlocillin or ticarcillin. Streptococcus pneumoniae and Haemophilus influenzae species were highly susceptible to all of the penicillins tested. Ticarcillin had relatively poor activity against enterococci. The rate of bacterial killing with multiples of the minimal inhibitory concentration of azlocillin, ampicillin, or ticarcillin was tested for E. coli, P. mirabilis, P. aeruginosa, and Klebsiella spp. Increasing concentrations increased the bactericidal effect. The effect of combining azlocillin, ampicillin, or ticarcillin with an aminoglycoside was studied by using both killing curves and checkerboards. The isobolograms constructed from the checkerboards showed a synergistic pattern for the organisms tested, which included E. coli, P. aeruginosa, Klebsiella spp., P. mirabilis, and enterococci. However, the rate of killing was increased by the combination only for P. aeruginosa and enterococci.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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