Comparative Human In Vivo Study of an Immediate-Release Tablet Over-Encapsulated by Gelatin & Hydroxypropyl Methyl Cellulose Capsules – Impact of Dissolution Rate on Bioequivalence
Introduction
Rapid and consistent in-vivo drug dissolution is critical for drug absorption. In-vitro dissolutions tests are used to predict in-vivo disintegration and dissolution properties of drug products. The in-vitro disintegration and dissolution times of tablets and capsules can vary significantly based on their composition and processing. Though small differences in-vitro dissolution are not expected to result in significant in-vivo performance differences, the slight in-vitro dissolution delay observed by over-encapsulation for double blind clinical trials, as well as switching from gelatin to HPMC capsules often raises concerns on the potential impact on in-vivo bioavailability.
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