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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Wonnemann, Meinolf Schug, Barbara Anschütz, Maria Brendel, Erich De Nucci, Gilberto Blume, Henning |
| Description | Country affiliation: Germany Author Affiliation: Wonnemann M ( SocraTec R&D GmbH, Oberursel, Germany. meinolf.wonnemann@socratec-pharma.de) |
| Abstract | OBJECTIVE: The objective of this study was to compare the in vitro and in vivo characteristics of 2 nifedipine modified-release tablet formulations for once-daily dosing marketed in the European community, which were expected to be bioequivalent. METHODS: In vitro dissolution was tested at different pH values prior to the clinical part of the study. Either 1 tablet of a test formulation or of the reference formulation, both containing 30 mg nifedipine, were administered to healthy white male volunteers immediately after a high-fat breakfast in a randomized, open-label, 2-period crossover design. Plasma samples obtained over the subsequent period of 48 hours were analyzed using a validated LC-MS/MS method. Safety profile and tolerability of the study medications were assessed by analysis of adverse events obtained by vital sign measurements, electrocardiography, and clinical laboratory analysis. RESULTS: Twelve volunteers were enrolled (median age, 28.0 years [range, 21-42 years]; mean body mass index, 24.2 kg/m(2) [range, 19.3-27.0 kg/m(2)]). In vitro dissolution experiments revealed a significant pH dependency in drug release from the investigational tablets, while the reference tablets were found to have pH-independent dissolution. After oral administration of both tablet formulations in the fed state, marked differences in rate and extent of bioavailability were observed. Geometric mean of AUC(0-last)(test, 504.21 h x ng/mL; reference, 361.28 h x ng/mL) was significantly higher for the test product, with a point estimate of 140% and a corresponding 90% CI of 121% to 161%. For the comparison of Cmax values, geometric means were: test, 76.46 ng/mL; reference, 19.20 ng/mL, with a point estimate of 398% and a CI of 316% to 503%. Thus, a significant difference in rate and extent of bioavailability was observed between the 2 products. CONCLUSIONS: Although both treatments were well tolerated by all volunteers, the test and reference tablets were found to have different pharmacokinetic properties when administered after a high-fat meal. |
| File Format | HTM / HTML |
| ISSN | 01492918 |
| Issue Number | 1 |
| Volume Number | 30 |
| e-ISSN | 1879114X |
| Journal | Clinical Therapeutics |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2008-01-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Pharmacology Calcium Channel Blockers Administration & Dosage Pharmacokinetics Eating Nifedipine Administration, Oral Adult Area Under Curve Biological Availability Blood Cross-over Studies Delayed-action Preparations Dietary Fats Humans Hydrogen-ion Concentration In Vitro Techniques Male Solubility Tablets Journal Article Randomized Controlled Trial |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology Pharmacology (medical) |
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