Postantibiotic effects of eleven antimicrobials on five bacteria.

Abstract:

AIM:To investigate the postantibiotic effects (PAE) of different classes of antimicrobials against five different types of bacteria. METHODS:Minimal inhibitory concentrations (MIC) were determined by twofold macrodilution in broth. The antimicrobial agents were eliminated by washing method after the bacteria were exposed to antimicrobials for 1 h or 2 h. Growth curves were followed by viable counts, and then the PAE were calculated. RESULTS:Macrolides induced PAE of 3.10 h to 4.15 h on S aureus, and 1.85 h to 3.3 h against S pneumoniae, which were longer than PAE induced by other tested antimicrobials (P<0.01). Macrolides induced PAE of 1 h to 4 h against H influenzae, with azithromycin producing the longest PAE of 4 h. Ciprofloxacin and amikacin induced PAE of 1.38 h to 2.00 h on E coli and K pneumoniae, which were longer than that of beta-lactams, piperacillin, cefazolin, or cefotaxime, with PAE of 0.1 h to 0.5 h (P<0.01). CONCLUSION:Different classes of antimicrobials induce different periods of PAE. As an important pharmacodynamic parameter, PAE provide reference data for the determination of the optimal dosing regimen and reasonable use of antimicrobials.

journal_name

Acta Pharmacol Sin

authors

Wang MG,Zhang YY,Zhu DM,Zhang J,Shi YG

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

804-8

issue

9

eissn

1671-4083

issn

1745-7254

journal_volume

22

pub_type

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