Sustained release matrix system using hydroxyethyl cellulose and hydroxypropyl cellulose polymer blends
First Claim
1. A sustained release pharmaceutical matrix comprising a homogeneous matrix containing a therapeutically effective amount of a medicament and a polymer blend of hdyroxypropyl cellulose (HPC) and hydroxyethyl cellulose (HEC) provided in an amount of about 18 weight percent or less to provide a sustained release of said medicament, wherein the ratio of HPC to HEC is in the range from about 10:
- 90 to about 90;
10.
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Abstract
The present invention is directed to a novel sustained release matrix and oral dosage form comprising a homogeneous matrix formed from a wet granulation containing an effective amount of a medicament and a polymer blend of hydroxypropyl cellulose and hydroxyethyl cellulose. The present invention also discloses a novel process for making a sustained release oral dosage form comprising wet granulating a medicament with a polymer blend of hydroxypropyl cellulose and hydroxyethyl cellulose to form a homogeneous matrix, wherein the polymer blend is provided in an amount effective to control the release of said medicament, then forming the homogenous matrix into a solid oral dosage form.
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Citations
21 Claims
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1. A sustained release pharmaceutical matrix comprising a homogeneous matrix containing a therapeutically effective amount of a medicament and a polymer blend of hdyroxypropyl cellulose (HPC) and hydroxyethyl cellulose (HEC) provided in an amount of about 18 weight percent or less to provide a sustained release of said medicament, wherein the ratio of HPC to HEC is in the range from about 10:
- 90 to about 90;
10. - View Dependent Claims (5, 6, 8, 9)
- 90 to about 90;
- 2. The matrix of claim 2 wherein the polymer blend contains in the range of from 80 to 62.5 weight percent HPC and in the range of from 20 to 37.5 weight percent HEC.
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10. A process for making a sustained release oral dosage form comprising wet granulating a medicament with a polymer blend of hydroxypropyl cellulose (HPC) and hydroxyethyl cellulose (HEC), wherein the polymer blend is provided in an amount of about 18 weight percent or less and the ratio of HPC to HEC is in the range of from about 10:
- 90 to about 90;
10, wherein the polymer blend is provided to control the release of said medicament, to form a homogeneous matrix, then forming the homogenous matrix into a solid oral dosage form. - View Dependent Claims (11, 12, 13, 14, 15, 16)
- 90 to about 90;
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17. A sustained release oral dosage form comprising a homogeneous matrix containing a therapeutically effective amount of a medicament and a polymer blend of hydroxpropyl cellulose (HPC) and hydroxethyl cellulose (HEC) provided in an amount of not more than about 18 weight percent wherein the ratio of HPC to HEC is in the range of from about 10:
- 90 to about 90;
10, effective to provide a sustained release of said medicament in a solid oral dosage form. - View Dependent Claims (18, 19, 20, 21)
- 90 to about 90;
Specification