CA2198630A1 - Acetaminophen sustained-release formulation - Google Patents
Acetaminophen sustained-release formulationInfo
- Publication number
- CA2198630A1 CA2198630A1 CA002198630A CA2198630A CA2198630A1 CA 2198630 A1 CA2198630 A1 CA 2198630A1 CA 002198630 A CA002198630 A CA 002198630A CA 2198630 A CA2198630 A CA 2198630A CA 2198630 A1 CA2198630 A1 CA 2198630A1
- Authority
- CA
- Canada
- Prior art keywords
- release
- sustained
- dosage form
- particles
- coated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/16—Amides, e.g. hydroxamic acids
- A61K31/165—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide
- A61K31/167—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide having the nitrogen of a carboxamide group directly attached to the aromatic ring, e.g. lidocaine, paracetamol
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/20—Pills, tablets, discs, rods
- A61K9/2072—Pills, tablets, discs, rods characterised by shape, structure or size; Tablets with holes, special break lines or identification marks; Partially coated tablets; Disintegrating flat shaped forms
- A61K9/2077—Tablets comprising drug-containing microparticles in a substantial amount of supporting matrix; Multiparticulate tablets
- A61K9/2081—Tablets comprising drug-containing microparticles in a substantial amount of supporting matrix; Multiparticulate tablets with microcapsules or coated microparticles according to A61K9/50
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
- A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
- A61K9/5005—Wall or coating material
- A61K9/5021—Organic macromolecular compounds
- A61K9/5026—Organic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyvinyl pyrrolidone, poly(meth)acrylates
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/04—Centrally acting analgesics, e.g. opioids
Abstract
An orally administrable sustained-release dosage form includes particles of an active pharmaceutical ingredient which is coated with a polymeric material that is water-insoluble, but water-permeable and water-swellable, so that the sustained-release dosage form provides controlled release which is independent of certain variable physiological factors such as pH. In accordance with one aspect of the invention, the active pharmaceutical ingredient is acetaminophen and the coated acetaminophen particles are combined with uncoated acetaminophen particles to provide a combination immediate-release/sustained-release dosage form. In accordance with another aspect of the invention, the active pharmaceutical ingredient is coated with a methacrylate ester copolymer, and the coated particles are combined with uncoated particles of an active pharmaceutical ingredient to provide a combination immediate-release/sustained-release dosage form, wherein the sustained-release component provides a release rate which is substantially independent of physiological factors such as pH. The final orally administrable dosage form can appear as compressed tablets, capsules or pouches.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/608,839 | 1996-02-27 | ||
US08/608,839 US5773031A (en) | 1996-02-27 | 1996-02-27 | Acetaminophen sustained-release formulation |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2198630A1 true CA2198630A1 (en) | 1997-08-27 |
CA2198630C CA2198630C (en) | 2006-01-10 |
Family
ID=24438247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002198630A Expired - Lifetime CA2198630C (en) | 1996-02-27 | 1997-02-26 | Acetaminophen sustained-release formulation |
Country Status (5)
Country | Link |
---|---|
US (2) | US5773031A (en) |
JP (1) | JPH1029936A (en) |
CA (1) | CA2198630C (en) |
GB (1) | GB2310601B (en) |
MX (1) | MX9701465A (en) |
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-
1996
- 1996-02-27 US US08/608,839 patent/US5773031A/en not_active Expired - Fee Related
-
1997
- 1997-02-26 CA CA002198630A patent/CA2198630C/en not_active Expired - Lifetime
- 1997-02-26 JP JP9058287A patent/JPH1029936A/en active Pending
- 1997-02-26 MX MX9701465A patent/MX9701465A/en not_active IP Right Cessation
- 1997-02-27 GB GB9704069A patent/GB2310601B/en not_active Expired - Lifetime
- 1997-10-31 US US08/962,599 patent/US6126969A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB9704069D0 (en) | 1997-04-16 |
JPH1029936A (en) | 1998-02-03 |
CA2198630C (en) | 2006-01-10 |
MX9701465A (en) | 1998-04-30 |
GB2310601A (en) | 1997-09-03 |
US6126969A (en) | 2000-10-03 |
GB2310601B (en) | 1999-12-22 |
US5773031A (en) | 1998-06-30 |
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