Antibacterial effect of etoposide in vitro

Etoposide, an antitumor drug, had an effect in vitro against all strains of gram-positive bacteria studied but not against three gram-negative bacteria. The MICs ranged between 6.2 and 50 micrograms/ml. In short-term-growth experiments, etoposide had a bactericidal efficacy that was 10 to 50 times lower than that of cloxacillin.