Sustained release pharmaceutical composition

A - Human Necessities – 61 – K

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A61K 9/32 (2006.01) A61K 9/36 (2006.01) A61K 9/50 (2006.01)

Patent

CA 2007181

A sustained release pharmaceutical pellet composition comprises a core element of an active ingredient of high solubility and a coating for the core element. The coating is partially soluble at a highly acidic pH to provide a slow rate of release of the active ingredient. The active ingredient may be a variety of highly soluble medicines. The coating includes at least one insoluble matrix polymer selected from the group consisting of acrylic ester polymers, methacrylic ester polymers and mixtures thereof; at least one enteric polymer selected from the group consisting of cellulose acetate phthalate, hydroxypropyl methyl-cellulose phthalate, polyvinyl acetate phthalate, methacylic acid copolymer, hydroxypropyl methylcellulose acetate succinate, shellac, cellulose acetate trimellitate and mixtures thereof and at least one partially acid soluble component selected from polyvinylpyrrolidone, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polyethylene glycol, polyvinyl alcohol and monomers therefor and mixtures thereof. This coating composition is particularly suited in providing sustained release of the active ingredient and maintaining the desired effective level in the blood stream.

Une composition pharmaceutique en pastille pour libération prolongée, comprend un noyau constitué d'un ingrédient actif de grande solubilité et un enrobage pour ce noyau. L'enrobage est partiellement soluble à pH fortement acide, ce qui permet de ne libérer que lentement l'ingrédient actif. Ce dernier peut être un médicament fortement soluble. L'enrobage renferme : au moins un polymère matriciel insoluble, choisi dans le groupe constitué de polymères d'ester acrylique, de polymères d'ester méthacrylique et de leurs mélanges; au moins un polymère gastro-résistant, choisi dans le groupe constitué d'acétate-phtalate de cellulose, de phtalate d'hydroxypropylméthylcellulose, de poly(acétate-phtalate vinylique), de copolymères d'acide méthacylique, d'acétate-succinate d'hydroxypropylméthylcellulose, de shellac, d'acétate-trimellitate de cellulose, ainsi que de leurs mélanges; au moins un constituant soluble partiellement acide, choisi parmi la polyvinylpyrrolidone, l'hydroxypropylcellulose, l'hydroxypropylméthylcellulose, le polyéthylèneglycol, le poly(alcool vinylique), ainsi que parmi leurs monomères et leurs mélanges. Cette composition d'enrobage est particulièrement utile pour la libération prolongée de l'ingrédient actif et le maintien de la concentration efficace souhaitable dans la circulation sanguine.

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