Inventors:
Patrick S.-L. Wong - Burlingame CA
David E. Edgren - El Granada CA
Felix Theeuwes - Los Altos CA
Phyllis I. Gardner - Stanford CA
Francisco Jao - San Jose CA
Jason J. Wan - Palo Alto CA
Assignee:
Alza Corporation - Mountain View CA
International Classification:
A61K 922
US Classification:
424473, 424468, 424469, 424470, 424486, 424488, 514781, 514782, 514784
Abstract:
The present invention is directed to an active agent dosage form which is adapted for retention in the stomach and useful for the prolonged delivery of an active agent formulation to a fluid environment of use. The active agent dosage form is a polymer matrix that swells upon contact with the fluids of the stomach. A portion of the polymer matrix is surrounded by a band of insoluble material that prevents the covered portion of the polymer matrix from swelling and provides a segment of the dosage form that is of sufficient rigidity to withstand the contractions of the stomach and delay expulsion of the dosage form from the stomach until substantially all of the active agent has been dispensed.