Selfemulsifiable formulation having enhanced bioabsorption...

A - Human Necessities – 61 – K

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A61K 38/13 (2006.01) A61K 9/107 (2006.01) A61K 9/48 (2006.01)

Patent

CA 2422580

A selfemulsifiable formulation comprising of lipophilic system consisting of medium chain triglyceride of caprylic acid and capric acid, and of labrasol, wherein labrasol also serves as surfactant, which is combined with other selected surfactants, like cremophore RH 40 and/or polysorbate 80 is disclosed, wherein said formulation also comprises of immunosuppression agent essentially cyclosporine, hydrophilic agent preferably ethanol, antioxidant preferably alpha-tocopherol and preservative preferably benzyl alcohol, and said formulation is prepared by dissolving immunosuppression agent in hydrophilic agent followed by entrapping with lipophilic agent and subsequent treatment with surfactants, preservative and antioxidant, and is filled in soft-gelatine shell capable of rupturing in less than 10 minutes to deliver said formulation in upper part of gastrointestinal tract, wherein it forms thermodynamically stable oil in water microemulsions in situ to have enhanced bioavailability and bioabsorption of immunosuppression agent, which can show its enhanced immunosuppression activities thereby.

L'invention concerne une formulation auto-émulsifiable comprenant un système lipophile, constitué de triglycéride à chaîne moyenne d'acides caprylique et caprique, et de labrasol, le labrasol servant aussi d'agent tensioactif, combiné à d'autres agents tensioactifs choisis, tels que du crémophore RH 40 et/ou du polysorbate 80, cette formulation comprenant aussi un agent immunosuppresseur, essentiellement de la cyclosporine, un agent hydrophile, de préférence, de l'éthanol, un antioxydant, de préférence de l'alpha-tocophérol et un agent conservateur, de préférence de l'alcool benzylique. La préparation de cette formulation consiste à dissoudre l'agent immunosuppresseur dans un agent hydrophile, à le piéger avec un agent lipophile, à traiter avec des tensioactifs, un agent de conservation et un antioxydant, et à placer le tout dans des capsules de gélatine molle capables de se rompre en moins de 10 minutes afin de libérer cette formulation dans la partie supérieure du tractus gastro-intestinal, dans laquelle elle forme des micro-émulsions in situ d'huile dans l'eau thermodynamiquement stables afin d'obtenir un agent immunosuppresseur à biodisponibilité et biabsorption améliorées pouvant ainsi présenter des activités améliorées d'immunosuppresseur.

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