Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Capsules
Patent
1992-11-27
1993-11-09
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Capsules
424438, 424493, A61K 948
Patent
active
052600696
ABSTRACT:
Unit dosage form for delivering drugs into the body in a series of sequential, pulsatle releasing events employs conventional pharmaceutical equipment and processes for optimum economy, reliability, and bioavailability. The system can be used with drugs which cannot be released by diffusion through a porous coating, such as water insoluble drugs. A plurality of populations of pellets is provided within a unit dosage form such as a capsule or tablet. The pellets are composed of a core containing the drug and a swelling agent which expands in volume when exposed to water. The core is enclosed within a membrane or coating which is permeable to water. The membrane is composed of a water insoluble and permeable film forming polymer, a water soluble film forming polymer and a permeability reducing agent. When the unit dose releases the pellets into the digestive tract, water diffuses through the coating and into the core. As water is taken up by the swelling agent, the core expands, exerting force on the coating until it bursts, releasing the drug. The permeability reducing agent reduces the rate at which water reaches the swelling agent, thereby delaying release time. The water soluble polymer dissolves, weakening the coating so that it bursts sooner. By varying the proportions of the three coating ingredients and/or coating thickness from one pellet population to another, the release timing of the pellets can be very effectively controlled.
REFERENCES:
patent: 4684516 (1987-08-01), Bhutani
patent: 4863744 (1989-09-01), Vrguhart et al.
patent: 4871549 (1989-10-01), Ueda et al.
patent: 5110597 (1992-05-01), Wong et al.
Anda SR Pharmaceuticals Inc.
Benston W.
Blum Alvin S.
Page Thurman K.
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