Sustained release pharmaceutical preparation using diffusion bar

Details Sustained release pharmaceutical preparation using diffusion bar Sustained release pharmaceutical preparation using diffusion bar

1990-10-05

1992-04-07

Page, Thurman K.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Particulate form

424458, 424459, 424461, 424462, 424473, 424494, 424497, A61K 916, A61K 952, A61K 954

Patent

active

051026686

ABSTRACT:
A sustained-release pH independent pharmaceutical preparation having multi-units of microparticles comprising a granular drug which is less soluble at low pH and more soluble at high pH. The granular drug is surrounded by or admixed with a pH controlled material formed from at least one polymer that is hydrophilic at low pH and hydrophobic at higher pH and is in a ratio with the granular drug such that the resulting sustained-release pharmaceutical preparation is independent from the pH environment. The resulting sustained-release pH independent pharmaceutical preparation allows a uniform release of drug for a period of at least 12 to 24 hours. In an alternative embodiment, the drug may be more soluble at low pH and less soluble at higher pH and the pH controlled material formed from at least one polymer that is hydrophobic at low pH and hydrophilic at higher pH.

REFERENCES:
patent: 4205060 (1980-05-01), Monsimer et al.
patent: 4734285 (1988-03-01), Alderman
patent: 4752470 (1988-06-01), Mehta
patent: 4772475 (1988-09-01), Fukui et al.
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patent: 4925676 (1990-05-01), Ghebre-Sellassie et al.
patent: 4927639 (1990-05-01), Ghebre-Sellassie et al.
patent: 4927640 (1990-05-01), Dahlinder et al.
patent: 4983401 (1991-01-01), Eichel et al.

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