| 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. |