Abstract
The pharmacokinetics of cefoperazone, a new semisynthetic cephalosporin, were studied in 34 patients with neoplastic disease. This compound was administered in a variety of doses and schedules without observable toxicity in any patient. The mean peak serum concentration after a 15-min intravenous infusion of 2 g was 264 microgram/ml after the first dose; the serum half-life was 2.1 h. There was no significant change in half-life or serum concentrations after 4 or 7 days of therapy. The mean peak serum concentration after infusion of 1 g over 15 min was 133 microgram/ml, with a mean of 10.7 microgram/ml at 6 h. The serum half-life was 2 h. The mean peak serum concentration after infusion of 1 g over 0.5 h was 101 microgram/ml. When 8 g was subsequently administered daily by a continuous infusion schedule, levels were maintained at 80 microgram/ml. When the dose was increased to 16 g daily, serum concentrations were maintained at an average of 153 microgram/ml. Only 37% of cefoperazone was recovered in the urine in a 12-h period after the initial dose, suggesting the importance of other mechanisms of excretion; however, serum concentrations in one patient with renal insufficiency were significantly higher than serum concentrations in patients with normal renal function.
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