Sustained release formulations utilizing pharmaceutical excipient having improved compressibility with modified microcrystalline
First Claim
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1. A method of preparing a sustained-released pharmaceutical formulation, comprising:
- forming an aqueous slurry containing a mixture of microcrystalline cellulose and a compressibility augmenting agent which (i) physically restricts the proximity of the interface between adjacent cellulose surfaces, (ii) inhibits interactions between adjacent cellulose surfaces, or (iii) accomplishes both (i) and (ii) above;
drying said slurry to obtain an augmented microcrystalline cellulose comprising a plurality of agglomerated particles of said microcrystalline cellulose in intimate association with said augmenting agent;
adding an effective amount of an active agent to said slurry or said dried augmented microcrystalline cellulose; and
incorporating an effective amount of a sustained-release carrier to obtain a final product which provides sustained-release of said active agent in an environment of use.
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Abstract
Sustained release formulations include an augmented microcrystalline cellulose, an active agent, and a sustained release carrier and methods for making same are disclosed.
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Citations
36 Claims
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1. A method of preparing a sustained-released pharmaceutical formulation, comprising:
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forming an aqueous slurry containing a mixture of microcrystalline cellulose and a compressibility augmenting agent which (i) physically restricts the proximity of the interface between adjacent cellulose surfaces, (ii) inhibits interactions between adjacent cellulose surfaces, or (iii) accomplishes both (i) and (ii) above; drying said slurry to obtain an augmented microcrystalline cellulose comprising a plurality of agglomerated particles of said microcrystalline cellulose in intimate association with said augmenting agent; adding an effective amount of an active agent to said slurry or said dried augmented microcrystalline cellulose; and incorporating an effective amount of a sustained-release carrier to obtain a final product which provides sustained-release of said active agent in an environment of use. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification