Mezlocillin sodium

Mezlocillin is a β-lactam antibiotic and derivative of ampicillin (Item No. 14417). It is active against B. fragilis, E. lentum, P. morbillorum, and F. nucleatum (MICs = 8, 4, 2, and 4 μg/ml, respectively). Mezlocillin (32 μg/ml) is also active against 10 strains of S. faecalis. In vivo, mezlocillin (240 mg/kg) increases survival and reduces bacteremia in a rabbit model of S. faecalis endocarditis. It completely eliminates lung P. morbillorum, E. lentum, and F. nucelatum, but not B. fragilis, in a rabbit model of pulmonary P. morbillorum, E. lentum, F. nucelatum, and B. fragilis infection when administered at a dose of 300 mg/kg. Formulations containing mezlocillin have been used in the treatment of various bacterial infections.