Control of Pseudomonas sepsis in mice with azlocillin combined with gentamicin.

The antibacterial activity of azlocillin VUFB and gentamicin was tested in vivo. To mice with Pseudomonas sepsis the test substances were injected either alone or combined, and the mortality was assessed. The test substances were freeze dried injectable azlocillin and gentamicin (Pharmachim). Azlocillin was injected into mice either intravenously or intramuscularly in graduated doses of 50-500 mg/kg once daily. The therapeutic effect was assessed on the basis of survival of the treated mice. Our expectation of a potentiated effect of the azlocillin-gentamicin combination was confirmed. After intramuscular administration of azlocillin plus gentamicin 90% of the mice survived, in comparison with 40% only after either azlocillin or gentamicin alone.