Pharmacokinetics and serum bactericidal activity of vancomycin alone and in combination with ceftazidime in healthy volunteers

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Abstract
The pharmacokinetics and serum bactericidal activity of vancomycin alone and in combination with ceftazidime were investigated in 10 healthy volunteers. The pharmacokinetic parameters showed no significant differences (P less than 0.05) between single and combined administration. No antagonistic effects were observed in serum bactericidal activity with the combination against 20 gram-positive and 20 gram-negative locally isolated bacteria. A titer of greater than or equal to 1:8 was generated by the combination against all test strains except enterococci. Seven of ten volunteers developed a typical "red man9s syndrome" during the administration of 1.0 g of vancomycin.