title: Nevirapine quantification in human plasma by high-performance liquid chromatography coupled to electrospray tandem mass spectrometry. Application to bioequivalence study.
abstract: A rapid, sensitive and specific method to quantify nevirapine in human plasma using dibenzepine as the internal standard (IS) was developed and validated. The method employed a liquid-liquid extraction. The analyte and the IS were chromatographed on a C(18) analytical column, (150 x 4.6 mm i.d. 4 microm) and analyzed by tandem mass spectrometry in the multiple reaction monitoring mode. The method had a chromatographic run time of 5.0 min and a linear calibration curve over the range 10-5000 ng ml(-1) (r(2) > 0.9970). The between-run precision, based on the relative standard deviation for replicate quality controls was 1.3% (30 ng ml(-1)), 2.8% (300 ng ml(-1)) and 3.6% (3000 ng ml(-1)). The between-run accuracy was 4.0, 7.0 and 6.2% for the above-mentioned concentrations, respectively. This method was employed in a bioequivalence study of two nevirapine tablet formulations (Nevirapina from Far-Manguinhos, Brazil, as a test formulation, and Viramune from Boehringer Ingelheim do Brasil Química e Farmacêutica, as a reference formulation) in 25 healthy volunteers of both sexes who received a single 200 mg dose of each formulation. The study was conducted using an open, randomized, two-period crossover design with a 3 week washout interval. The 90% confidence interval (CI) of the individual ratio geometric mean for Nevirapina/Viramune was 96.4-104.5% for AUC((0-last)), 91.4-105.1% for AUC((0-infinity)) and 95.3-111.6% for C(max) (AUC = area under the curve; C(max) = peak plasma concentration). Since both 90% CI for AUC((0-last)) and AUC((0-infinity)) and C(max) were included in the 80-125% interval proposed by the US Food and Drug Administration, Nevirapina was considered bioequivalent to Viramune according to both the rate and extent of absorption.
authors.affiliation: Faculty of Medical Sciences, State University of Campinas, P.O. Box 6111, Campinas, SP, Brazil.
authors.forename: Tiago L
authors.initials: TL
authors.lastname: Laurito
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Santagada
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Caliendo
authors.forename: Celso H
authors.initials: CH
authors.lastname: Oliveira
authors.forename: Rafael E
authors.initials: RE
authors.lastname: Barrientos-Astigarraga
authors.forename: Gilberto
authors.initials: G
authors.lastname: De Nucci
mesh_terms: D000328:Adult; D019540:Area Under Curve; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019829:Nevirapine / Q000097:blood / Q000493:pharmacokinetics*; D011897:Random Allocation; D015203:Reproducibility of Results; D018894:Reverse Transcriptase Inhibitors / Q000097:blood / Q000493:pharmacokinetics*; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013810:Therapeutic Equivalency
chemical_list: D018894:Reverse Transcriptase Inhibitors; D019829:Nevirapine