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  • Title: Pharmacokinetics and safety profile of tigecycline in children aged 8 to 11 years with selected serious infections: a multicenter, open-label, ascending-dose study.
    Author: Purdy J, Jouve S, Yan JL, Balter I, Dartois N, Cooper CA, Korth-Bradley J.
    Journal: Clin Ther; 2012 Feb; 34(2):496-507.e1. PubMed ID: 22249106.
    Abstract:
    BACKGROUND: Tigecycline, a broad-spectrum antibiotic used for treating serious bacterial infections in adults, may be suitable for pediatric use once an appropriate dosage is determined. OBJECTIVE: The aim of this study was to assess the pharmacokinetic (PK) properties, safety profile, and descriptive efficacy of tigecycline. METHODS: In this Phase II, multicenter, open-label clinical trial, children aged 8 to 11 years with community-acquired pneumonia (CAP), complicated intra-abdominal infection (cIAI), or complicated skin and skin structure infections (cSSSI) were administered tigecycline 0.75, 1, or 1.25 mg/kg. RESULTS: A total of 58 patients received ≥ 1 dose of tigecycline (31 boys; 44 white; mean age, 10 years; mean weight, 35 kg); 47 had data from samples available for PK analysis. The mean (SD) PK values were: C(max), 1899 (2954) ng/mL; T(max), 0.56 (0.18) hour; between-dose AUC, 2833 (1557) ng · h/mL; weight-normalized clearance, 0.503 (0.293) L/h/kg; and Vd(ss), 4.88 (4.84) L/kg. Overall clinical cure rates at test-of-cure were 94% (16/17), 76% (16/21), and 75% (15/20) in the 0.75-, 1-, and 1.25-mg/kg cohorts, respectively. The rates of protocol violations were higher in the 1- and 1.25-mg/kg groups, resulting in higher proportions of indeterminate clinical cure assessments relative to the 0.75-mg/kg cohort (19% and 15% vs 0%). The most frequent adverse event was nausea, which occurred in 50% of patients overall (29/58) and the prevalence of which was significantly higher in the 1.25-mg/kg group versus the 0.75-mg/kg group (65% vs 18%; P = 0.007). Pharmacodynamic simulations using MIC data from an ongoing microbiological surveillance trial predicted that a dosage of 1.2 mg/kg q12h would lead to therapeutic target attainment levels of up to 82% for the target AUC(0-24)/MIC ratios. CONCLUSION: A tigecycline dosage of ∼1.2 mg/kg q12h may represent the most appropriate dosage for subsequent evaluation in Phase III clinical trials in children aged 8 to 11 years with selected serious bacterial infections. ClinicalTrials.gov identifier: NCT00488345.
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