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  • Title: Nevirapine/lamivudine/stavudine as a combined-formulation tablet: bioequivalence study compared with each component administered concurrently under fasting condition.
    Author: Monif T, Tippabhotla SK, Garg M, Singla AK, Vijan T.
    Journal: Int J Clin Pharmacol Ther; 2006 Jun; 44(6):276-83. PubMed ID: 16800100.
    Abstract:
    OBJECTIVE: The objective of the study was to compare the bioequivalence of a fixed-dose combination of a nevirapine 200 mg, lamivudine 150 mg and stavudine 30 mg combination tablet with application of the 3 medications, at the same dosage, concurrently as separate formulations, in healthy, adult subjects under fasting conditions. MATERIAL AND METHODS: An open-label, balanced, randomized, 2-treatment, 2-period, 2-sequence, single-dose, crossover bioavailability study was conducted in 40 subjects with 21-day washout period between each treatment. Blood samples were collected for 168 hours. Plasma concentrations of nevirapine, lamivudine and stavudine were determined using a validated LC-MS-MS method. Noncompartmental pharmacokinetics and statistical analyses were performed using SAS (SAS Institute Inc., Cary, NC, USA) software (SAS System under Windows, Version 8.02). RESULTS: The ratios of least-square means and the 90% confidence intervals of the log-transformed data were calculated for AUC(0-t), AUC(0-inf), and Cmax. The 90% confidence interval for least-square mean ratio between test and reference formulation for log-transformed parameters Cmax, AUC(0-t) and AUC(0-inf) were within the requirements of the 80-125% range. CONCLUSION: The test formulation (Ranbaxy Laboratories Ltd., Gurgaon, India) is bioequivalent to the reference formulations both in terms of rate and extent of absorption after single-dose administration under fasting condition.
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