Cefsulodin (SCE-129, CFS) a new semisynthetic cephalosporin antibiotic for parenteral administration, was evaluated on its antibacterial activity, pharmacokinetic behavior and clinical effectiveness.
The antibacterial activity of CFS against
Pseudomonas aeruginosa was found to be markedly influenced with inoculum sizes. MICs of this antibiotic with an inoculum of 100-fold dilution against
P. aeruginosa were lower by 5 to 6 grades than those of Carbenicillin and they were almost compared to those of Gentamicin. Against
Escherichia coli and
Klebsiella pneumoniae, MICs of CFS were higher by 4 to 5 grades than those of Cephaloridine, Cephalothin, Cefazolin and Cephalexin.
Peak concentrations of CFS occurred in serum after 30 min. following intramuscular injection of single 250mg doses in two healthy adult volunteers exhibiting concentrations of 5.3 and 7.5μg/ml, which declined to 0.27 and 0.35μg/ml after 6 hrs, respectively. A cross-over study with probenecid showed that peak concentrations of 5.6 and 8.8μg/ml, respectively, occureed in serum after 30 min, following same doses, and these declined to 0.52 and 0.94μg/ml after 6 hrs.
Urinary recovery of CFS in 0-6 hr urine samples following intramuscular injection of single 250mg doses in same volunteers reached 52.48% and 63.74% without probenecid and 24.59% and 39.88% with probenecid, respectively.
CFS was given to 14 patients with respiratory-tract infections (3) infection associated with tracheoesophageal fistula (1) and urinary-tract infections (10) which were all due to P. aeruginosa in daily doses of 250 to 1, 500 mg for 3 to 56 days. The results were good in 8 patients (61.5%), fair in 1, poor in 4 and inevaluable in 1. Bacteriologically,
P. aeruginosa was eradicated in 7 patients (but, relapse in one case) and persisted in 7, the rate of eradication being 46.5% excluding the case of relapse. In the 3 cases of urinarytract infections due to plural pathogens including
P. aeruginosa, eradication or diminution of
P. aeruginosa count was noted, but the bacterial count of the other coexisting gram-negative rods increased.
No side effects nor abnormalities of laboratory tests associated with CFS treatment occurred.
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