Covered retard forms
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United States of America Patent
Stats
-
Feb 26, 1991
Grant Date -
N/A
app pub date -
Sep 12, 1988
filing date -
Sep 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a covered, solid retard form which in the case of oral administration remains in the stomach during periodic emptying and ensures continuous release. This dosage form contains the following components: (a) at least one component that expands on contact with body fluid and that contains a physiologically active substance or a combination of such substances, (b) at least one permeable hydrophilic membrane which surrounds component (a) and which is expansible at the site of use, and optionally (c) a covering which surrounds components (a) and membrance (b) and which disintegrates without delay under the action of a body fluid at the site of use.
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