Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Tablets – lozenges – or pills
Patent
1998-05-21
1999-05-18
Brouilette, D. Gabrielle
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Tablets, lozenges, or pills
424438, 6048921, A61K9/24
Patent
active
059049340
ABSTRACT:
The present invention is concerned with improving the delivery of a drug from a ruminal delivery device to give a consistent delivery of drug to the ruminal environment. Thus, the invention is directed to an improved ruminal drug delivery device comprising a semipermeable membrane having an exit orifice and defining a compartment, the compartment containing a swellable osmotic agent expandable driving member, a drug to be dispensed, a density element and, optionally, a partition layer between the osmotic expandable driving member and the drug formulation, wherein the improvement comprises an essentially gas-impermeable barrier means that separates the density element from the other components within the delivery device for isolating gases evolved from the density element from the other components within the delivery device. The barrier means further includes a coupling to transfer osmotic pressure to the semipermeable wall. The invention is also directed to methods and articles for providing a consistent delivery of drug from a ruminal drug delivery device.
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Magruder Judy A.
Maruyama Frederick H.
ALZA Corporation
Brouilette D. Gabrielle
Clarke Pauline Ann
Dillahunty Mary Ann
Stone Steven F.
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