title: Cross-over assessment of serum bactericidal activity of moxifloxacin and levofloxacin versus penicillin-susceptible and penicillin-resistant Streptococcus pneumoniae in healthy volunteers.
abstract: We compared the serum bactericidal activity (SBA) of moxifloxacin and levofloxacin against penicillin-susceptible and penicillin-resistant Streptococcus pneumoniae in 12 healthy volunteers. Each subject received 3 days of oral moxifloxacin 400 mg daily and levofloxacin 750 mg daily, respectively, with a 2- to 4-week washout period between regimens. Blood was drawn at 6 time points after the third dose of each antibiotic. Mean serum bactericidal titers (MSBTRs) for moxifloxacin were 4-fold higher than the mean titers for levofloxacin at each time point. For each drug, MSBTRs at each time point were the same or within one 2-fold dilution when analyzed according to the penicillin susceptibility of the strains or the sex of the subjects. The difference in SBA of the 2 drugs may have implications for the emergence of resistance and clinical outcome.
authors: Division of Allergy, Immunology, and Infectious Diseases, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA. hartda@umdnj.edu
authors: Daniel
authors: D
authors: Hart
authors: Melvin P
authors: MP
authors: Weinstein
mesh_terms: D000293:Adolescent; D000328:Adult; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D001372:Aza Compounds / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D005260:Female; D024841:Fluoroquinolones; D006801:Humans; D064704:Levofloxacin; D008297:Male; D000077266:Moxifloxacin; D015242:Ofloxacin / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D010403:Penicillin Resistance; D011804:Quinolines / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D015610:Serum Bactericidal Test; D013296:Streptococcus pneumoniae / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents; D001372:Aza Compounds; D024841:Fluoroquinolones; D011804:Quinolines; D064704:Levofloxacin; D015242:Ofloxacin; D000077266:Moxifloxacin