MICROPARTICLES WITH MODIFIED RELEASE OF AT LEAST ONE ACTIVE PRINCIPLE AND ORAL GALENIC FORM COMPRISING SAME

摘要

The invention concerns microparticulate systems with modified release of oral active principle(s). The invention aims at providing a novel multimicroparticulate galenic system operating in accordance with a dual time-dependent and pH-dependent release mechanism, which enables the following three parameters to be adjusted independently of one another: a) the latent period preceding the release of the active principle in the stomach; b) the pH triggering the release of the active principle in the intestine; c) the release speed of the active principle. This is achieved through the use of coated microparticles made from particles of active principle each coated with two coating films A and B. A comprises: film-forming (co)polymer (A1) insoluble in fluids of the gastrointestinal tract; ethylcellulose (co)polymer (A2) soluble in fluids of the gastrointestinal tract; plasticizing polyvinylpyrrolidone (A3); castor oil/optionally a surfactant and/or magnesium stearate lubricant (A4). B comprises a hydrophilic polymer (B1) bearing ionized groups with neutral pH (EUDRAGIT® L100-55) and a hydrophobic compound (B2) (LUBRITAB®).The invention also concerns medicines based on said microparticules.