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Cefamandole nafate, a new cephalosporin for parenteral use, was evaluated in vitro against 231 recent clinical isolates and in 12 patients. Cefamandole had activity equivalent to cefazolin against Staphylococcus aureus, Escherichia coli, and Klebsiella pneumoniae. Cefamandole was more active than cephalothin or cefazolin against Proteus mirabilis. Both cefamandole and cefazolin were as active as cephalothin against S. aureus, were slightly more active against K. pneumoniae, and were considerably more active against E. coli. All strains of indole-positive Proteus sp. were inhibited by 6.3 mug of cefamandole per ml but only 20% were inhibited by 25 mug of cefazolin or cephalothin per ml. Eighty-eight percent of Enterobacter sp. was inhibited by 25 mug of cefamandole per ml, but only 20 and 5% were inhibited by the same concentration of cefazolin and cephalothin, respectively. Peak levels of cefamandole ranged from 6.0 to 110 mug/ml in serum and levels ranged from 440 to 16,800 mug/ml in a 4- to 6-h collection of urine after a 500-mg or 1-g intramuscular dose (6.1 to 17.3 mg/kg) in patients with endogenous creatinine clearances of &gt;/=31 ml/min. These levels were done after the first dose, at mid-therapy, and at the end of therapy. There was no evidence of accumulation with the 500-mg or 1-g dose given every 4 to 6 h. The percentage of the dose excreted in the urine within the first 4 to 6 h after administration of cefamandole was &gt;/=43%. The half-life of cefamandole in serum was 49 to 126 min.

In Vitro Activity and Pharmacokinetics in Patients of Cefamandole, a New Cephalosporin Antibiotic