The present invention relates to a tablet composed of a core and a coating said core is formed by two or more layers, wherein at least one of them contains an active agent (3). Wherein one of said layers is formulated as a swellable composition (2), the other one (4) is composed of inert compounds retaining its size at least until the coated tablet is emptied from the stomach. The coating composition is selected from the group comprising water insoluble polymers, ph dependent polymers or mixtures thereof. The active agent is released after rupture of the coating.La présente invention concerne des comprimés enrobés à libération contrôlée qui conservent leur taille au moins le long d’une dimension et sont dès lors conservés pendant une période plus longue dans l’estomac.
