Abstract
When 10% oleic acid-albumin-dextrose-catalase-enriched Mueller-Hinton agar medium was employed, the MICs of clarithromycin (CLARI) at which 50 and 90% of 12 strains of Mycobacterium tuberculosis were inhibited were 64 and > 128 micrograms/ml, respectively, which are significantly greater than the achievable peak CLARI concentrations in serum and in lung tissue in humans. In two different mouse experiments, 4 to 6 weeks of treatment with CLARI at 200 mg/kg of body weight six times weekly produced neither bactericidal nor bacteriostatic effects against M. tuberculosis. Therefore, we conclude that CLARI as a single drug is inactive against M. tuberculosis.
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