Controlled release pharmaceutical compositions for prolonged effect
First Claim
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1. A layered pharmaceutical composition for controlled release of an active substance, comprising:
- a solid inner layer (A) comprising the active substance and a disintegrant, the solid inner layer (A) being positioned between two outer layers (B1) and (B2),each outer layer (B1) and (B2) comprising one or more substantially water soluble or crystalline polyethylene oxides (PEOs) having a molecular weight (MW) of about 100,000 daltons or greater, wherein the average molecular weight of the PEO present in each outer layer is about 100,000 daltons or greater, wherein each outer layer is free of the disintegrant, and wherein at least one of the outer layers (B1) and (B2) comprises the active substance, anda coating (C) forming a shell covering the solid inner layer (A) and partially covering outer layers (B1) and (B2) with two openings exposing a surface of each outer layer (B1) and (B2), wherein the coating (C) comprises a polymer and is substantially insoluble in and impermeable to gastrointestinal fluids;
wherein the solid inner layer (A), without the outer layers (B1) and (B2) and the coating (C), disintegrates within 60 minutes when subjected to a disintegrating test according to the Eur. Ph; and
wherein the release of the active substance contained in at least one of the outer layers (B1) and (B2) follows a zero order release pattern for at least 80% w/w release of the total content of the active substance in the outer layers (B1) and (B2).
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Abstract
Layered pharmaceutical composition suitable for oral use in the treatment of diseases where absorption takes place over a large part of the gastrointestinal tract. The composition comprising A) a solid inner layer comprising
- i) an active substance, and
- ii) one or more disintegrants/exploding agents, one of more effervescent agents or a mixture thereof.
The solid inner layer being sandwiched between two outer layers B1) and B2), each outer layer comprising
- iii) a substantially water soluble and/or crystalline polymer or a mixture of substantially water soluble and/or crystalline polymers, the polymer being a polyglycol in the form of one of a) a homopolymer having a MW of at least about 100,000 daltons, and b) a copolymer having a MW of at least about 2,000 daltons, or a mixture thereof, and
- iv) an active substance, which is the same as in said solid inner layer A), and layer A being different from layer B,
the layered composition being coated with a coating C) that has at least one opening exposing at least one surface of said outer layer, the coating being substantially insoluble in and impermeable to fluids and comprising a polymer, and the composition having a cylindrical form optionally with one or more tapered ends, wherein the ratio between the surface area of one end surface of the cylinder and the length of the cylinder is in a range of from 0.02 to 45 mm.
418 Citations
27 Claims
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1. A layered pharmaceutical composition for controlled release of an active substance, comprising:
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a solid inner layer (A) comprising the active substance and a disintegrant, the solid inner layer (A) being positioned between two outer layers (B1) and (B2), each outer layer (B1) and (B2) comprising one or more substantially water soluble or crystalline polyethylene oxides (PEOs) having a molecular weight (MW) of about 100,000 daltons or greater, wherein the average molecular weight of the PEO present in each outer layer is about 100,000 daltons or greater, wherein each outer layer is free of the disintegrant, and wherein at least one of the outer layers (B1) and (B2) comprises the active substance, and a coating (C) forming a shell covering the solid inner layer (A) and partially covering outer layers (B1) and (B2) with two openings exposing a surface of each outer layer (B1) and (B2), wherein the coating (C) comprises a polymer and is substantially insoluble in and impermeable to gastrointestinal fluids; wherein the solid inner layer (A), without the outer layers (B1) and (B2) and the coating (C), disintegrates within 60 minutes when subjected to a disintegrating test according to the Eur. Ph; and wherein the release of the active substance contained in at least one of the outer layers (B1) and (B2) follows a zero order release pattern for at least 80% w/w release of the total content of the active substance in the outer layers (B1) and (B2). - 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)
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Specification