Galenic formulations for oral use of rhein derivatives with delayed release for therapeutical use
US4861599A · kind A · utility
21Cited by
1References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Sep 30, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P29/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Several methods are disclosed for the preparation of oral pharmaceutical forms with delayed release of rhein and its derivatives. The pharmaceutically active ingredient is provided in the form of granules, coated with at least one of polyvinylpyrrolidone, shellac and hydroxypropylmethyl cellulose. The desired effect of the coating is to slow release of the pharmaceutically active ingredient by resisting gastric juices in the stomach, but gradually dissolving in the intestines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.