Sustained release preparations
First Claim
1. An oral pharmaceutical composition comprising ion exchange resin particles having particle sizes from about 30 microns to about 500 microns;
- at least one pharmaceutically active drug releasably bound to the particles to form a drug-ion exchange resin complex, wherein the drug-ion exchange resin complex is coated with an aqueous based diffusion barrier which comprises from about 1% to about 60%, by weight of the resin particles, of a water-permeable film-forming polymer which contains no substantial traces of an organic solvent.
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Abstract
Disclosed are sustained release drug particles suitable for forming sustained release oral pharmaceutical compositions. The sustained release drug particles comprise a drug-ion exchange resin complex and a water-permeable, diffusion barrier surrounding at least a portion of the drug-ion exchange resin complex. The diffusion barrier comprises a film-forming polymer and is free or contains no substantial traces of organic solvent. Also disclosed are oral pharmaceutical compositions, for example, oral suspensions, comprising the sustained release drug particles, a method for the controlled administration of a drug to a patient, and a method for manufacturing the sustained release drug particles. The method of manufacturing involves the use of an aqueous coating composition comprising a water-permeable film-forming polymer such as ethylcellulose.
156 Citations
34 Claims
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1. An oral pharmaceutical composition comprising ion exchange resin particles having particle sizes from about 30 microns to about 500 microns;
- at least one pharmaceutically active drug releasably bound to the particles to form a drug-ion exchange resin complex, wherein the drug-ion exchange resin complex is coated with an aqueous based diffusion barrier which comprises from about 1% to about 60%, by weight of the resin particles, of a water-permeable film-forming polymer which contains no substantial traces of an organic solvent.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for manufacturing sustained release drug particles for use in the manufacture of a sustained release preparation comprising contacting particles of an ion exchange resin with a pharmaceutically active drug to form a drug-ion exchange resin complex wherein the particle size of the ion exchange resin particles is from about 30 microns to about 500 microns;
- and coating the drug-ion exchange resin complex with an aqueous suspension of a water-permeable film-forming polymer which contains no substantial traces of an organic solvent such that the resulting coating has an average thickness of at least about 10 microns.
- View Dependent Claims (14, 15, 16, 17, 18)
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19. A pharmaceutical composition comprising:
- ion exchange resin particles having particle sizes from about 30 microns to about 500 microns;
at least one pharmaceutically active drug releasably bound to the ion exchange resin particles to form a drug-ion exchange resin complex; and
a pharmaceutically acceptable carrier, wherein the drug-ion exchange resin complex is coated with an aqueous based diffusion barrier which comprises a water-permeable film-forming polymer in an amount of from about 1% to about 60%, by weight of the ion exchange resin particles. - View Dependent Claims (20, 21)
- ion exchange resin particles having particle sizes from about 30 microns to about 500 microns;
- 22. A method for the controlled administration of a drug to a patient comprising administering to the patient a therapeutically acceptable dose of a composition comprising a diffusion barrier coated drug-ion exchange resin complex wherein the diffusion barrier is present in an amount of about 1% to about 60% by weight of the drug-ion exchange resin complex and the diffusion barrier comprises a water-permeable film-forming polymer and contains no substantial traces of an organic solvent.
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32. A drug particle suitable for forming a sustained release oral pharmaceutical composition comprising a drug-ion exchange resin complex, a solvating agent, and a water-permeable diffusion barrier surrounding at least a portion of the drug-ion exchange resin complex;
wherein the diffusion barrier comprises a film-forming polymer and is free or substantially free of traces of organic solvents. - View Dependent Claims (33)
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34. An oral pharmaceutical composition comprising ion exchange resin particles having particle sizes from 30 microns to about 500 microns;
- at least one pharmaceutically active drug releasably bound to the particles to form a drug-ion exchange resin complex, wherein the drug-ion exchange resin complex is coated with an aqueous based diffusion barrier which comprises from about 1% to about 60%, by weight of the resin particles, of a water-permeable film-forming polymer.
Specification