Abstract
Six antineoplastic antibiotics were tested against ten strains of Staphylococcus aureus. Four showed bacteriostatic and/or bactericidal activity against each of the ten strains, and two were only bacteriostatic for seven and nine strains, respectively. Using the cellophane transfer technique, combinations of these antineoplastic antibiotics with 16 antibacterial drugs were screened for combined bactericidal activity. Synergism or antagonism was demonstrated in about one-third of the combinations. Checkerboard titrations and killing curves confirmed these findings and indicated that the effective concentrations of the antibacterial agents were similar to those attainable in the serum after therapeutic doses of these drugs. Although the pharmacokinetics of the six antineoplastic antibiotics in humans are not fully known, at least one of them has a peak serum level corresponding to those values at which a bactericidal effect was produced in vitro.
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