A Single-Dose, Randomized, Two-Way Crossover Study Comparing Two Olanzapine Tablet Products in Healthy Adult Male Volunteers Under Fasting Conditions

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A single-dose, randomized, two-way crossover study comparing two olanzapine tablet products in healthy adult male volunteers under fasting conditions Clinical Therapeutics, Volume 31, Issue 3, March 2009, Pages 600-608 Ahmed H. Elshafeey, Mohamed A. Elsherbiny, Mohsen M. Fathallah Methods: This bioequivalence study was carried out in healthy male volunteers using a single-dose, randomized, 2-way crossover design under fasting conditions. Statistical analysis of the pharmacokinetic parameters Cmax, AUC0-72, and AUC0-∞ was conducted to determine bioequivalence (after log-transformation of data using analysis of variance and 90% CIs) and to gain marketing approval in Egypt. The formulations were considered to be bioequivalent if the log-transformed ratios of the 3 pharmacokinetic parameters were within the predetermined bioequivalence range (ie, 80%–125%), as established by the US Food and Drug Administration (FDA). Both the test product (Trademark: Integrol® [Global Napi Pharmaceuticals, Cairo, Egypt]) and the reference product (Trademark: Zyprexa® [Eli Lilly and Company, Basingstoke, Hampshire, United Kingdom]) were administered as 10-mg tablets with 240 mL of water after an overnight fast on 2 treatment days, separated by a 2-week washout period. After dosing, serial blood samples were collected for 72 hours. Plasma samples were analyzed using a sensitive, reproducible, and accurate liquid chromatography-tandem mass spectrometry method capable of quantitating olanzapine in the range of 0.167 to 16.7 ng/mL, with a lower limit of quantitation of 0.167 ng/mL. Adverse events were reported by the volunteers as instructed or observed by the resident physician, and were recorded, tabulated, and evaluated.

Results: Twenty-four healthy adult male volunteers participated in this study. Their mean (SD) age was 24.7 (6.2) years (range, 19–41 years), mean weight was 73.4 (6.7) kg (range, 64–89 kg), and mean height was 174.25 (4.6) cm (range, 168–186 cm). Values for Cmax,...
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