Comparative Effect of Tetracycline and Doxycycline on the Occurrence of Resistant Escherichia coli in the Fecal Flora

Author:

Bartlett John G.1,Bustetter Larry A.,Gorbach Sherwood L.,Onderdonk Andrew B.

Affiliation:

1. Infectious Diseases Section, Veterans Administration Hospital, Sepulveda, California 91343

Abstract

Antibiotic-induced changes in the fecal microflora after oral administration of tetracycline hydrochloride and doxycycline for 8 to 10 days were compared. A significant difference was noted in the concentrations of Escherichia coli resistant to tetracyclines. With tetracycline hydrochloride, there was a mean increase of approximately 10 4 resistant strains per g compared to only 10 1 /g for doxycycline. This difference is ascribed to reduced intestinal concentrations of bioactive drug with recommended oral dosage for doxycycline.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

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5. Comparative effect of broad-spectrum antibiotics on nonspore-forming anaerobes and normal flora;Finegold S. M.;Ann. N. Y. Acad. Sci.,1967

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