Abstract:
WHAT IS KNOWN AND OBJECTIVE:Fluconazole is an antifungal agent that is commonly used to treat patients with serious systemic fungal infections in intensive care units. Fosfluconazole is a phosphate prodrug of fluconazole, which was developed to reduce the volume of fluid required to administer fluconazole by intravenous injection. The objective of this study was to characterize the pharmacokinetics of the antifungal fluconazole after the intravenous administration of the prodrug fosfluconazole or fluconazole in critically ill patients with serious systemic fungal infections, by population pharmacokinetic analysis using the nonmem software package. METHODS:Clinical biochemical data including serum fluconazole levels were obtained from 57 patients treated in the intensive care unit along with two naïve pooled patients gleaned from previous reports. The pharmacokinetic model of fluconazole was estimated using a one-compartment model. The probability that the area under the concentration-time curve is higher than 800 μg h/mL was determined by simulation. RESULTS:It was assumed that all the administered fosfluconazole was converted to fluconazole with an estimated fosfluconazole-fluconazole conversion rate constant of 2·05/h. The significant covariates for clearance for fluconazole (CL) and volume of distribution for fluconazole (Vd) were resulted in creatinine clearance (CLcr) and body weight (BW), respectively, in the final pharmacokinetic model equations: CL (L/h) = 0·799 × [CLcr (mL/min)/92·7](0·685) and Vd (L) = 48·1 × [BW (kg)/65](1·40) , where the interpatient variabilities in CL and Vd and the intrapatient variability were 44·8%, 79·7% and 19·8%, respectively. On the basis of the results of the Monte Carlo simulation, the probabilities of target attainment were 60%, 26% and 11% for 400 mg/day administration as fluconazole equivalent at CLcr values of 40, 70 and 100 mL/min, respectively. WHAT IS NEW AND CONCLUSION:The present population pharmacokinetic analysis strongly indicates that fosfluconazole (and fluconazole) dosage should be optimized in terms of CLcr in critically ill patients.
journal_name
J Clin Pharm Therjournal_title
Journal of clinical pharmacy and therapeuticsauthors
Aoyama T,Hirata K,Hirata R,Yamazaki H,Yamamoto Y,Hayashi H,Matsumoto Ydoi
10.1111/j.1365-2710.2011.01297.xsubject
Has Abstractpub_date
2012-06-01 00:00:00pages
356-63issue
3eissn
0269-4727issn
1365-2710journal_volume
37pub_type
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journal_title:Journal of clinical pharmacy and therapeutics
pub_type: 杂志文章,评审
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pub_type: 杂志文章
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更新日期:2014-02-01 00:00:00