Cefpiramide (CPM) is a new cephalosporin with good activity against Pseudomonas. Sustained high serum concentrations are observed. We studied CPM killing kinetics using an in vitro model that simulates the pharmacokinetic profile observed in humans following a single intramuscular injection. The strain tested was Pseudomonas aeruginosa NCTC 8203. CPM was compared to cefoperazone (CPZ), cefsulodin (CFS) and ceftazidime (CTZ). These drugs differed only for the time-interval to bacterial regrowth that was in the following ascending order: CFS, CPZ, CTZ and CPM. This finding corroborates the fact that cefpiramide's pharmacokinetic properties allow wider space intervals between doses than for other drugs.
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