In an open randomised crossover study the antibacterial activity of pefloxacin and norfloxacin was assessed in the urine after a single 800-mg oral dose in 14 healthy female volunteers. Pefloxacin demonstrated lower peak concentrations in the urine than norfloxacin (mean, 217.2 mg/l versus 492.9 mg/l as determined by the microbiological assay) but pefloxacin was present over a longer period of time in sufficient concentrations than norfloxacin. Mean urine levels of at least 2 mg/l were present for 7 days after pefloxacin administration and 2 days after norfloxacin administration as determined by the microbiological assay. Overall, the urinary recovery of pefloxacin and norfloxacin amounted to 49.3% and 25.1%, respectively, of the total administered dose. The average urine bactericidal activity against the five test organisms was as follows: against reference strain Escherichia coli ATCC 25922 susceptible to nalidixic acid (Nal-S) for 5 days with pefloxacin and 2 days with norfloxacin; against three clinical isolates, one strain each of E. coli resistant to nalidixic acid (Nal-R), Klebsiella pneumoniae Nal-R, and Staphylococcus saprophyticus, for 3 days with pefloxacin and 24 h with norfloxacin; and against a clinical isolate of Enterococcus faecalis for 2 days with pefloxacin and 12 h with norfloxacin. In conclusion, pefloxacin as a single dose proved to have sufficiently high and long-lasting urine bactericidal activity against urinary pathogens. These findings support the results of a meta-analysis of seven clinical trials in patients with uncomplicated lower UTI, demonstrating a single oral dose of 800 mg pefloxacin to be as effective as a conventional treatment with comparative drugs.
Dopexamine has no or only weak effects on carbohydrate metabolism, its effects on fat and protein metabolism are comparable to those of fenoterol. This metabolic profile may be advantageous in increasing cardiac output in patients with impaired glucose tolerance.
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