Solid oral form with dual release profile, containing...

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/26 (2006.01) A61K 9/52 (2006.01) A61K 9/58 (2006.01) A61K 9/62 (2006.01)

Patent

CA 2721232

The invention relates to a solid form intended for the oral administration of at least one active agent and capable of ensuring a dual mechanism for the release of said active agent, whereby the first release is conditioned by time and the second release is conditioned by pH. The invention is characterised in that the active agent is present in the form of a microparticulate system, the microparticulates of which include a core which is made up entirely or partly of said active agent and coated with at least one layer which conditions the release profile of the active agent and which is formed by a material containing at least: (i) 25% to 75% by weight, relative to the total weight of the coating, of at least a polymer A that is insoluble in the gastrointestinal fluids, (ii) 25% to 75% by weight, relative to the total weight of the coating, of at least a polymer B that has a solubilisation pH value in the pH range of from 5 to 7, and (iii) 0 to 25% by weight, relative to the total weight of the coating, of at least one plasticiser, said polymers A and B being present in a polymer(s) B/polymer(s) A weight ratio that is at least equal to 0.25. The invention also relates to a method for preparing this solid form and the corresponding microparticulates.

La présente invention concerne une forme solide, destinée à l'administration par voie orale d'au moins un actif et apte à garantir un double mécanisme de libération dudit actif, le premier étant conditionné par le temps et le second étant conditionné par le pH, caractérisée en ce que ledit actif y est présent sous la forme d'un système microparticulaire dont les microparticules possèdent un coeur formé en tout ou partie dudit actif et enrobé d'au moins une couche conditionnant ledit profil de libération dudit actif et formée d'un matériau composé d'au moins (i) 25 à 75 % en poids par rapport au poids total dudit enrobage d'au moins un polymère A insoluble dans les fluides gastro- intestinaux, (ii) 25 à 75 % en poids par rapport au poids total dudit enrobage d'au moins un polymère B possédant une valeur de pH de solubilisation comprise dans la plage de pH de 5 à 7, et (iii) 0 à 25 % en poids par rapport au poids total dudit enrobage d'au moins un plastifiant, lesdits polymères A et B étant présents dans un rapport pondéral polymère(s) B/polymère(s) A au moins égal à 0,25 Elle vise en outre un procédé de préparation de cette forme solide et des microparticules correspondantes.

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