Controlled release tacrine drug delivery systems and methods for preparing same
US5576022A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Apr 12, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K31/47
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention pertains to controlled release tacrine drug delivery systems comprising an immediate release composition and a sustained release composition wherein (1) the immediate release composition comprises in percentages by weight of the immediate release composition: (A) immediate release pellets comprising: (a) nonpareil seeds in an amount from about 25% to about 75%; (b) tacrine in an amount from about 10% to about 80%; and (c) a binding agent in an amount from about 1% to about 10%; and (B) a sealing layer over the immediate release pellets comprising: (a) a sealing agent in an amount up to about 6%, and (b) a first plasticizing agent in an amount up to about 5%; and (2) the sustained release composition comprises in percentages by weight of the sustained release composition; (A) the immediate release composition; and (B) a sustaining layer over the immediate release composition comprising; (a) a water-insoluble polymer in an amount from about 40% to about 90%; (b) a water-soluble polymer in an amount up to about 10%; and (c) a second plasticizing agent in an amount up to about 10%; wherein the sustaining layer and the immediate release composition are present in t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.