Abstract: A dosage form is disclosed that comprises means inside the dosage form for providing a substantially drug-free interval before the dosage form delivers a drug from inside the dosage form. The dosage form in an embodiment comprises a drug on the exterior of the dosage form, which drug is available for immediate delivery.
Type:
Grant
Filed:
April 1, 1992
Date of Patent:
July 28, 1998
Assignee:
ALZA Corporation
Inventors:
Patrick S.-L. Wong, Felix Theeuwes, Atul Devdatt Ayer, Anthony L. Kuczynski