title: Kinetics of mezlocillin and carbenicillin.
abstract: The kinetics of mezlocillin, a semisynthetic acylureido penicillin, more active than carbenicillin against many gram-negative bacteria, were compared with those of carbenicillin. Following an intravenous infusion of 4 gm in 5 min to 8 normal men there was an average serum level of 294 microgram/ml for mezlocillin and 365 microgram/ml for carbenicillin. The t1/2 for mezlocillin was 47 min and that for carbencillin was 70 min. The apparent volume of distribution was 13.4 L for mezlocillin and 14.4 L for carbenicillin. The mean urinary recovery of mezlocillin was 72% and that for carbenicillin was 92%. Constant infusion of 5 mg of mezlocillin over 2 hr gave steady-state levels of 234 microgram/ml. Half-life, apparent volume of distribution, and serum and renal clearance of mezlocillin after constant infusion were in the same range as those after rapid infusion.
mesh_terms: D000328:Adult; D002228:Carbenicillin / Q000008:administration & dosage / Q000378:metabolism*; D006801:Humans; D007263:Infusions, Parenteral; D007275:Injections, Intravenous; D007700:Kinetics; D008297:Male; D010406:Penicillins / Q000008:administration & dosage / Q000378:metabolism*
chemical_list: D010406:Penicillins; D002228:Carbenicillin