Controlled release pharmaceutical compositions for prolonged effect
First Claim
1. A layered pharmaceutical composition formulated and configured to provide controlled release of an active substance, the pharmaceutical composition comprising:
- a solid inner layer (A) comprising the active substance and an effervescent agent selected to aid release of the active substance from the solid inner layer (A);
two outer layers (B1) and (B2) that are free of the effervescent agent, each of the two outer layers (B1) and (B2) comprising the active substance and a polymer selected from a substantially water soluble or crystalline polyglycol having a molecular weight (MW) of about 100,000 daltons or greater, or a substantially water soluble or crystalline polyglycol copolymer having a MW of about 2,000 daltons or greater, and;
a coating (C) that is impermeable to gastrointestinal fluids, the coating (C) comprising a polymer, wherein the coating (C) forms a shell around the solid inner layer (A) and the two outer layers (B1) and (B2), the solid inner layer (A) is positioned between the two outer layers (B1) and (B2) within the coating (C), and the shell formed by the coating comprises a length extending between two open ends with each of the two open ends exposing a surface area of each of the two outer layers (B1) and (B2);
wherein the solid inner layer (A), without the outer layers (B1) and (B2) and the coating (C), is formulated such that it disintegrates within 60 minutes when subjected to the disintegration test according to Ph. Eur.;
wherein the release of the active substance contained in 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);
wherein the coating (C) appears as a substantially intact empty shell after the composition has been subjected to the dissolution test according to Ph. Eur.
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Accused Products
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.
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Citations
27 Claims
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1. A layered pharmaceutical composition formulated and configured to provide controlled release of an active substance, the pharmaceutical composition comprising:
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a solid inner layer (A) comprising the active substance and an effervescent agent selected to aid release of the active substance from the solid inner layer (A); two outer layers (B1) and (B2) that are free of the effervescent agent, each of the two outer layers (B1) and (B2) comprising the active substance and a polymer selected from a substantially water soluble or crystalline polyglycol having a molecular weight (MW) of about 100,000 daltons or greater, or a substantially water soluble or crystalline polyglycol copolymer having a MW of about 2,000 daltons or greater, and; a coating (C) that is impermeable to gastrointestinal fluids, the coating (C) comprising a polymer, wherein the coating (C) forms a shell around the solid inner layer (A) and the two outer layers (B1) and (B2), the solid inner layer (A) is positioned between the two outer layers (B1) and (B2) within the coating (C), and the shell formed by the coating comprises a length extending between two open ends with each of the two open ends exposing a surface area of each of the two outer layers (B1) and (B2); wherein the solid inner layer (A), without the outer layers (B1) and (B2) and the coating (C), is formulated such that it disintegrates within 60 minutes when subjected to the disintegration test according to Ph. Eur.; wherein the release of the active substance contained in 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); wherein the coating (C) appears as a substantially intact empty shell after the composition has been subjected to the dissolution test according to Ph. Eur. - 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