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  • Title: Bactericidal activity of ciprofloxacin in serum and urine against Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Staphylococcus aureus and Streptococcus faecalis.
    Author: Lagast H, Husson M, Klastersky J.
    Journal: J Antimicrob Chemother; 1985 Sep; 16(3):341-7. PubMed ID: 2932416.
    Abstract:
    Ten volunteers received three doses of 500 mg ciprofloxacin, orally every 12 hours. After the last dose, mean serum levels were (mg/l +/- SD) 2.4 +/- 0.83 at 1 h; 0.91 +/- 0.30 at 4 h and 0.18 +/- 0.04 at 12 h. At 1 h the median serum bactericidal activity was satisfactory only against the Escherichia coli (1:256) and Klebsiella pneumoniae (1:128). In urine collected from 0 to 4 h and 8 to 12 h after the last dose, the mean ciprofloxacin level was respectively 482.5 +/- 324.7 and 80.9 +/- 48.2 mg/l +/- SD. Bactericidal activity in urine was high even against the least susceptible species tested: Pseudomonas aeruginosa, Staphylococcus aureus and Streptococcus faecalis. A post antibiotic effect was demonstrated in 22 out of the 29 strains tested, ranging mainly from 1 to 3 h. Ciprofloxacin 500 mg orally twice a day is a bactericidal regimen against a wide range of urinary pathogens but has a limited systemic activity.
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