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Comparative Bioavailability of a Generic and Two Compounded Naproxen Sodium Suspensions Administered to Rats 
Lílian Grace da Silva Solon1, Gerlane Bernardo Coelho Guerra2, Aurigena Antunes de Araújo2*, José Mário Barichello3, José Pérez-Urizar4 and Luiz Alberto Lira Soares5 
1Department of Pharmacy,Universidade Federal do Rio Grande do Norte. Natal, Brazil

2Department of Biophysics and Pharmacology, Universidade Federal do Rio Grande do Norte. Natal, Brazil
3Department of Medicines, Universidade Federal da Bahia, Salvador, Brazil
4Pharmacology and Physiology Laboratory, Universidad Autónoma de San Luis Potosí, SLP, Mexico
5Department of Pharmacy, Universidade Federal de Pernambuco, Recife, Brazil
*Corresponding author: Aurigena Antunes de Araújo,
Departamento de Biofísica e Farmacologia - Centro de Biociências Av. Senador Salgado Filho, S/N - Lagoa Nova, 59078-900 – Natal - RN, Brazil,
Tel: +55 84 32153419;
Fax: +55 84 32153402;
E-mail: [email protected]
Citation: Silva Solon LG, Coelho Guerra GB, Araújo AA, Barichello JM, Pérez-Urizar J, et al. (2010) Comparative Bioavailability of a Generic and Two Compounded Naproxen Sodium Suspensions Administered to Rats. J Bioanal Biomed 2: 048-054. doi: 10.4172/1948-593X.1000021 
 
Copyright: © 2010 Silva Solon LG, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 
 
Abstract
The purpose of this study was to determine naproxen concentrations in rat plasma samples by HPLC and to compare the bioavailability of a generic and two compounded naproxen sodium suspensions (test 1 and test 2). Analysis was run at a flow rate of 1.2 mL.min-1 with a mobile phase of acetonitrile: NaH2PO4 0.01 M pH 4.00 (50:50, v/v) at 280 nm, using a C18 column (150 mm x 4.6 mm, 5 μm). The calibration curve was linear (R2 = 0.9987) over the range of 0.25 - 200 μg.mL-1. The precision for inter and intra-day analysis ranged from 2.46% to 12.39%. Cmax, Tmax and AUCt were 191.25 11.17 μg.mL-1, 1.00 0.106 h and 2438.16 291.34 μg.h.mL-1 for the reference drug, 188.22 24.78 μg.mL-1, 1.06 0.092 h and 1755.02 228.90 μg.h.mL-1 for test 1, and 160.50 10.58 μg.mL-1, 0.66 0.102 h and 1955.28 142.80 μg.h.mL-1 for test 2. No signifi cant differences were found based on analysis of variance, with mean values and 90% CI of test2/reference ratio (Cmax 83.92% and AUCt 80.19%). For test1/reference ratio, the result was Cmax 98.41% and AUCt 71.98%. Based on these results, it can be concluded that the validated method was successfully applied to this study; the test 1 formulation failed to demonstrate a bioequivalence to the reference drug; however, the test 2 and reference naproxen sodium suspension were bioequivalent in terms of the rate and extent of absorption under these conditions. 
 
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