Oral preparation containing at least one active pharmaceutical substance in a matrix capable of swelling in an aqueous medium
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United States of America Patent
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May 29, 2001
Grant Date -
N/A
app pub date -
Jul 27, 1999
filing date -
Sep 28, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An oral preparation, comprising at least one pharmaceutical active compound in a matrix which is swellable in aqueous medium, which is released from the matrix into the aqueous medium in a delayed manner on swelling thereof, while the matrix is largely resistant to disintegration during the release process, it is characterized in that it is a layered tablet with layers adhering to one another, of which at least one layer is the swellable matrix layer and at least another layer is an auxiliary and/or excipient layer, and in that the swellable matrix layer contains an amount of crosslinked amylose.
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