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The pharmacokinetics and safety of ceforanide and cefazolin were compared in normal subjects after 30-min intravenous infusions of 2-, 3-, and 4-g single doses and 4-g twice-daily doses for 10 days. No significant differences were observed in plasma-renal pharmacokinetic parameters between single and multiple doses of ceforanide. Half-life (t((1/2)), 2.8 h), plasma clearance (Cl(p), 48 ml/min per 1.73 m(2)), and renal clearance (Cl(0-12h) (r), 47 ml/min per 1.73 m(2); tubular secretion, 44%, and glomerular filtration, 56%) did not change with increased dose or on multiple dosing. No significant change was observed in t((1/2)) (1.9 h), area under the plasma concentration-time curve, Cl(r) (60 ml/min per 1.73 m(2); tubular secretion, 80%, and glomerular filtration, 20%), or Cl(p) (75 ml/min per 1.73 m(2)) for 4-g single doses compared with twice-daily administration of cefazolin. A small increase in cefazolin clearance was observed when plasma concentrations were greater than 100 mug/ml, when the single dose was increased from 2 to 4 g; this was a result of the decrease in percentage of plasma protein binding and increased renal clearance due to increased glomerular filtration. The increase in renal clearance resulted in a lack of linear proportionality of the plasma area under the curve with dose over a range of 2 to 4 for both cephalosporins, although this effect was much less marked with ceforanide. Both compounds were well tolerated both locally and systemically. There was no evidence of any change in renal function based on clearances of drug, p-aminohippuric acid, or creatinine, and other standard clinical parameters.

Clinical Pharmacokinetics and Safety of High Doses of Ceforanide (BL-S786R) and Cefazolin