Oral sustained release acetaminophen formulation and process
First Claim
1. The process of preparing an acetaminophen-sustained release shaped and compressed tablet characterized by a slow release of the acetaminophen upon administration comprising the following steps:
- (A) forming a granulating agent by dissolving 5-25 parts by weight of the total composition of Povidone in water or in an alcohol-water mixture;
(B) blending together the following parts by weight of the total composition of ingredients with sufficient acetaminophen to comprise 68 to 94 percent by weight of the total composition in dry powder form;
space="preserve" listing-type="tabular">______________________________________ Ingredient Parts by Weight ______________________________________ Hydroxyethyl Cellulose 5-25 wicking agent 5-25 ______________________________________ (C) adding the granulating agent from Step A to the blended powders from Step B, and mixing in a high shear granulator to form a wet granulation;
(D) drying the wet granulation of Step C;
(E) milling the dried granulation from Step D;
(F) thoroughly blending the milled dried granulation from Step E with the following parts by weight of the total composition of ingredients in dry powder form;
space="preserve" listing-type="tabular">______________________________________ Ingredient Parts by Weight ______________________________________ erosion promoter 1-15 wicking agent 5-45 lubricant 0-10 glidant 0-5; and
______________________________________ (G) compressing the final granulation from Step F into a tablet or tablet layer.
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Accused Products
Abstract
An acetaminophen-sustained release tablet or tablet layer is formed by making a wet granulation, using Povidone (PVP) in water or alcohol-water as the granulating fluid which is mixed with acetaminophen, hydroxyethyl cellulose, a wicking agent e.g. microcrystalline cellulose, then drying and milling the granulation and blending with dry powdered erosion promoter, e.g. pregelatinized starch, wicking agent, lubricant e.g. magnesium stearate and glidant e.g. silicon dioxide, and compressing the resultant granulation, which upon administration results in a slow release of the acetaminophen.
131 Citations
17 Claims
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1. The process of preparing an acetaminophen-sustained release shaped and compressed tablet characterized by a slow release of the acetaminophen upon administration comprising the following steps:
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(A) forming a granulating agent by dissolving 5-25 parts by weight of the total composition of Povidone in water or in an alcohol-water mixture; (B) blending together the following parts by weight of the total composition of ingredients with sufficient acetaminophen to comprise 68 to 94 percent by weight of the total composition in dry powder form;
space="preserve" listing-type="tabular">______________________________________ Ingredient Parts by Weight ______________________________________ Hydroxyethyl Cellulose 5-25 wicking agent 5-25 ______________________________________(C) adding the granulating agent from Step A to the blended powders from Step B, and mixing in a high shear granulator to form a wet granulation; (D) drying the wet granulation of Step C; (E) milling the dried granulation from Step D; (F) thoroughly blending the milled dried granulation from Step E with the following parts by weight of the total composition of ingredients in dry powder form;
space="preserve" listing-type="tabular">______________________________________ Ingredient Parts by Weight ______________________________________ erosion promoter 1-15 wicking agent 5-45 lubricant 0-10 glidant 0-5; and
______________________________________(G) compressing the final granulation from Step F into a tablet or tablet layer. - View Dependent Claims (2, 3, 4, 5)
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- 6. A shaped and compressed sustained release therapeutic composition comprising Acetaminophen, a granulating agent and excipients combined into a matrix, characterized by a slow release of the Acetaminophen upon administration, wherein the granulating agent and excipients include Hydroxyethyl Cellulose and Povidone, and wherein the total amount of granulating agent and excipients is effective to bind the Acetaminophen in a sustained release solid matrix but is less than about 35 percent of the weight of said shaped and compressed composition.
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7. A shaped and compressed Acetaminophen sustained release tablet made by wet granulating a sufficient amount of Acetaminophen to comprise from about 68 to 94 percent of the total composition with the Excipients of Part I and the Granulating Agent of Part II, drying and milling the resultant granulations, and then blending with the Excipients of Part III and compressing into a tablet, wherein the ingredients of Parts I, II and III comprise the following:
space="preserve" listing-type="tabular">______________________________________ Ingredient Parts by Weight ______________________________________ Part I Excipients Hydroxyethyl Cellulose 5-25 Microcrystalline Cellulose 5-25 Part II Granulating Agent Povidone 5-25 Water or Alcohol-Water q.s Part III Excipients Pregelatinized Starch 2-15 Microcrystalline Cellulose 5-45 Magnesium Stearate 0-10 Colloidal Silicon Dioxide 0-5 ______________________________________- View Dependent Claims (8)
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10. A process of preparing an acetaminophen sustained release bi-layer tablet comprising a first layer of immediate release and a second layer of sustained slow release of acetaminophen according to the steps of:
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(A) preparing an immediate release layer comprising acetaminophen and pharmaceutically acceptable excipients; and (B) preparing a sustained release layer comprising acetaminophen as the active ingredient according to the steps of; (1) forming a granulating agent by dissolving about 5-25 parts by weight of the total sustained release layer of Povidone in alcohol or an alcohol-water mixture; (2) blending together a sufficient amount of acetaminophen to comprise 68 to 94 percent of the total weight of the sustained release layer with the following ingredients in dry powder form in parts by weight of the total sustained release layer as indicated;
space="preserve" listing-type="tabular">______________________________________ Ingredient Parts by Weight ______________________________________ hydroxyethyl cellulose 5-25 wicking agent 5-25;
______________________________________(3) adding the granulating agent from Step 1 to the blended powders from Step 2, and forming a wet granulation; (4) drying the wet granulation of Step 3; (5) milling the dried granulation Step 4; (6) thoroughly blending the milled dried granulation from Step 5 with the following ingredients in dry powder form;
space="preserve" listing-type="tabular">______________________________________ Ingredient Parts bv Weight ______________________________________ erosion promoter 1-15 wicking agent 5-45 lubricant 0-10 glidant 0-5; and
______________________________________(C) combining and compressing the immediate release layer of Step A with the sustained release layer of Step B into a bi-layered tablet. - View Dependent Claims (11, 12, 13)
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- 14. A shaped and compressed bi-layer therapeutic composition comprising acetaminophen in a first immediate release layer and a second sustained release layer wherein the immediate release layer comprises acetaminophen and pharmaceutically acceptable excipients and the sustained release layer comprises acetaminophen, a granulating agent and excipients combined into a matrix, wherein the granulating agent and excipients of the sustained release layer include hydroxyethyl cellulose and povidone, and wherein the total amount of said granulating agent and excipients is effective to bind the acetaminophen in a sustained release solid matrix but is less than about 32 percent of the weight of the sustained release layer of said shaped and compressed bi-layer composition.
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17. A shaped and compressed bi-layered immediate release layer and sustained release layer acetaminophen tablet made by combining an immediate release layer comprising acetaminophen and pharmaceutically acceptable excipients with a sustained release layer made by wet granulating a sufficient amount of acetaminophen to comprise 68 to 94 percent of the total weight of the sustained relase layer with the Excipients of Part I and the Granulating Agent of Part II, drying and milling the resultant granulations, and then blending with the Excipients of Part III and compressing the two layers into a tablet, wherein the ingredients of Parts I, II and III comprise the following:
space="preserve" listing-type="tabular">______________________________________ Range of Parts by Weight of the Total Ingredient Sustained Release Layer ______________________________________ Part I Excipients Hydroxyethyl Cellulose 5-25 Microcrystalline Cellulose 5-25 Part II Granulating Agent Povidone 5-25 Alcohol or Alcohol-Water q.s. Part III Excipients Pregelatinized Starch 2-15 Microcrystalline Cellulose 5-45 Magnesium Stearate 0-10 Colloidal Silicon Dioxide 0-5 ______________________________________
Specification