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  • Title: Multiple-dose ciprofloxacin kinetics in normal subjects.
    Author: Aronoff GE, Kenner CH, Sloan RS, Pottratz ST.
    Journal: Clin Pharmacol Ther; 1984 Sep; 36(3):384-8. PubMed ID: 6467798.
    Abstract:
    To determine multiple-dose kinetics of the quinoline carboxylic acid derivative ciprofloxacin, we gave 12 normal subjects ciprofloxacin, 250 mg by mouth every 12 hr for 13 doses. Plasma concentrations were measured by HPLC after the first, seventh, and thirteenth doses. Peak and trough plasma concentrations were measured daily. Ciprofloxacin was rapidly absorbed from the gastrointestinal tract and reached maximum serum concentrations about 1 hr after dosing. Ciprofloxacin elimination t1/2 increased from 3.71 hr after the first dose to 6.51 hr after the thirteenth dose (P less than 0.05). Apparent plasma clearance decreased from 0.823 to 0.629 l/kg/hr because of decreased nonrenal clearance. Drug cumulation did not occur throughout the experiment. We conclude that concentrations of ciprofloxacin in excess of the minimum inhibitory concentrations for many important pathogens can be achieved in plasma and that controlled clinical trials of ciprofloxacin efficacy in selected systemic infections are warranted.
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