Jan 1, 1976

Bactericidal activity and pharmacology of flucloxacillin

The American Journal of the Medical Sciences
M G BergeronL Weinstein

Abstract

Flucloxacillin, a recent addition to the group of isoxazolyl penicillins, was studied in vitro and in normal volunteers. The bactericidal activity of the drug against most strains of gram-positive bacteria including penicillin-resistant Staphylococcus aureus was similar to that of oxacillin and approximately fourfold greater than that of cloxacillin. Each of the three penicillins was administered orally to a group of ten volunteers for eight days in a dose of 500 mg four times a day. The mean concentrations of flucloxacillin in the serum were two- to sixfold higher than those of the other two agents on the first, fourth and eighth days of therapy. The percentage of flucloxacillin bound by serum protein was 94.6 per cent; for cloxacillin and oxacillin the values were 93.5 and 91.5 per cent, respectively. Using these data, the concentrations of free flucloxacillin in serum were found to be twice as high as those of cloxacillin and oxacillin. These findings suggest that, when administered orally, this new agent may offer some therapeutic advantage over oxacillin and cloxacillin.

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Mentioned in this Paper

Gram-Positive Bacteria
Oxacillin, Monosodium Salt, Monohydrate
Haemophilus influenzae
Tegopen
Oxacillin
Serum Proteins
Plasma Protein Binding Capacity
Bactericidal Activity
Isoxazoles
Bacteria, Flesh-Eating

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