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Antimicrob Agents Chemother. 1978 March; 13(3): 389-393

In vitro study of clavulanic acid in combination with penicillin, amoxycillin, and carbenicillin.

R Wise, J M Andrews and K A Bedford

ABSTRACT

The activity of clavulanic acid alone and in combination with penicillin, amoxycillin, and carbenicillin was studied. Marked reductions in the minimum inhibitory concentrations (MICs) for a wide spectrum of beta-lactamase-producing clinical isolates were found. Of particular interest were the decreased MICs of penicillin for Bacteroides fragilis and beta-lactamase-producing strains of Neisseria gonorrhoea in the presence of the clavulanic acid. Beta-lactamase-producing strains of Escherichia coli, Klebsiella spp., and indole-negative Proteus also showed considerably increased susceptibility to amoxycillin in combination with clavulanic acid. Two beta-lactamase-producing strains of Pseudomonas aeruginosa remained resistant to carbenicillin in the presence of clavulanic acid.

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Antimicrob Agents Chemother. 1978 March; 13(3): 389-393

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