Transport of new quinolone antibacterial agents (quinolones) at the blood-brain barrier (BBB) was studied in vitro by using immortalized rat brain capillary endothelial cells RBEC1, and in vivo by using the brain perfusion method in rats and multidrug-resistant mdr1a/1b gene-deficient mice. The permeability coefficient of grepafloxacin measured by brain perfusion was increased by an excess of u...

OBJECTIVES To assess the effect of quinolone prophylaxis following chemotherapy for malignancies on the emergence of resistant bacteria in neutropenic patients. METHODS Systematic review and meta-analysis of randomized controlled trials comparing quinolone prophylaxis with placebo or no intervention, or another antibiotic, for the prevention of bacterial infections in afebrile neutropenic pat...

The influence of quinolones on electrically evoked pyramidal cell activity in the rat hippocampus in vitro was studied by using the slice technique. We hoped to learn more about the possible mechanisms for the development of side effects of different quinolones and to find a possible treatment. As reported earlier (W. Dimpfel, M. Spüler, A. Dalhoff, W. Hofmann, and G. Schlüter, Antimicrob. Agen...

The in-vitro effects of new quinolones and oral cephem antibiotics in various combinations on 26 strains of clinically isolated Serratia marcescens were assessed. The in-vitro activities of ofloxacin and ciprofloxacin in combination with either cefpodoxime or cefcamate were evaluated by the chequerboard titration method. These combinations showed synergistic and additive effects against most of...

Background: Pefloxacin is a newer broad-spectrum bactericidal fluoroquinolone antibiotic, with superior antibacterial activity in vivo against pathogenic ocular gram-negative and anaerobic microorganisms better pharmacokinetic properties.Methods: 100 bacterial conjunctivitis patients were prescribed topical pefloxacin 0.3% ophthalmological drops monotherapy, 2 each eye after every 3 hours for d...

The in vitro activities of three newly developed quinolone drugs (T-3262, NY-198, and fleroxacin [AM-833; RO 23-6240]) against 10 strains of clinically isolated Chlamydia trachomatis were assessed and compared with those of other quinolones and minocycline. T-3262 (MIC for 90% of isolates tested, 0.1 microgram/ml) was the most active of the quinolones. The NY-198 and fleroxacin MICs for 90% of ...

Resistance to beta-lactams and fluoroquinolones has been increasing in the treatment of urinary tract infections (UTIs), worldwide. Recent studies in Europe and the United States have demonstrated that steady increase in the rate of uropathogen’s resistance to commonly prescribed antibiotics is associated with plasmid-mediated resistance genes existence. According to the published data, acquirе...

Moxifloxacin is an 8-methoxyquinolone compound with activity against a wide range of bacteria. We tested its activity in comparison with four other quinolones and isoniazid against clinical isolates of mycobacteria. It proved to be the most active of the quinolones tested against Mycobacterium tuberculosis (MIC90 0.25 mg/L), Mycobacterium avium-intracellulare (MIC90 1.0 mg/L), Mycobacterium kan...

This review outlines some of pharmacokinetic parameters factors of fluoroquinolones antimicrobial agents. The oral absorption is not altered in human patients with disease. Plasma protein binding of the quinolones varies but newer quinolones less bound to plasma proteins. The serum concentration peak is reached rapidly. Most of the fluoroquinolone primary metabolites are active against bacteria...