Gastric retentive oral dosage form with restricted drug release in the lower gastrointestinal tract
DCFirst Claim
1. A method for delivering a pharmacologically active agent, the method comprising:
- orally administering to a patient in a fed mode a matrix/active agent tablet dosage form comprised of a polymer matrix and the pharmacologically active agent dispersed in said polymer matrix, said polymer matrix comprised of a biocompatible, hydrophilic polymer which(a) upon imbibition of water swells unrestrained dimensionally to a size effective to promote gastric retention for a time period of about 4 to 9 hours, and(b) maintains its size for the time period before it is diminished by erosion,wherein at least 75 wt. % of the active agent in the dosage form is released by erosion of the polymer matrix within the time period.
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Abstract
Controlled release oral dosage forms are provided for the continuous, sustained administration of a pharmacologically active agent to the upper gastrointestinal tract of a patient in whom the fed mode as been induced. The majority of the agent is delivered, on an extended release basis, to the stomach, duodenum and upper regions of the small intestine, with drug delivery in the lower gastrointestinal tract and colon substantially restricted. The dosage form comprises a matrix of a biocompatible, hydrophilic, erodible polymer with an active agent incorporated therein, wherein the polymer is one that both swells in the presence of water and gradually erodes over a time period of hours, with swelling and erosion commencing upon contact with gastric fluid, and drug release rate primarily controlled by erosion rate.
135 Citations
23 Claims
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1. A method for delivering a pharmacologically active agent, the method comprising:
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orally administering to a patient in a fed mode a matrix/active agent tablet dosage form comprised of a polymer matrix and the pharmacologically active agent dispersed in said polymer matrix, said polymer matrix comprised of a biocompatible, hydrophilic polymer which (a) upon imbibition of water swells unrestrained dimensionally to a size effective to promote gastric retention for a time period of about 4 to 9 hours, and (b) maintains its size for the time period before it is diminished by erosion, wherein at least 75 wt. % of the active agent in the dosage form is released by erosion of the polymer matrix within the time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification