Controlled-release formulations, method of manufacture, and use thereof
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United States of America Patent
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Jan 21, 2014
Grant Date -
Dec 24, 2009
app pub date -
Jun 20, 2008
filing date -
Jun 20, 2008
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Abstract
The present invention includes a controlled-release composition having a matrix. The matrix contains a pharmaceutically effective amount of an active agent or a pharmaceutically acceptable salt, solvate, ester, and/or prodrug thereof, an ionic non-gelling matrix polymer, and a pH modifier. The ionic non-gelling matrix polymer is practically insoluble and unswellable at a first aqueous fluid pH and is soluble at a second aqueous fluid pH. The pH modifier is present in an amount to control the release of the active agent from the composition. The controlled-release composition is substantially free of a gelling or swellable excipient. The present invention also provides methods of making and using the controlled-release compositions.
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