Abstract: The present invention concerns a novel sustained-release oral formulation of morphine sulphate in the form of microgranules. Each microgranule comprises a neutral support grain coated with an active layer and with a sustained-release layer, characterized in that the sustained-release layer contains a copolymer of methacrylic acid and of methyl methacrylate ester, the relative proportion of the free carboxyl groups and of the ester groups of which is equal to 0.5 approximately, and a silica exhibiting a hydrophobic character. The present invention also concerns a process for preparing these microgranules which is carried out entirely in aqueous medium by emplacing on neutral support grains.

Abstract: A process for manufacturing coated particles of &ggr;-aminobutyric acid analogue, whose lactam content by weight relative to the weight of &ggr;-aminobutyric acid analogue is less than 0.5% is disclosed. The process is characterized in that a coating solution of at least one polymer in an organic solvent is sprayed onto the particles of &ggr;-aminobutyric acid analogue.

Abstract: The present invention relates to a novel pharmaceutical form, in the form of spheroids, containing one or more active principles, which the exception of tiagabine.The invention also covers the process for the preparation of such spheroids and multiparticulate pharmaceutical preparations, such as tablets, containing these spheroids.These pharmaceutical preparations are intended for the delivery of the spheroids they contain, and are characterized by the absence of an adverse effect on the release profile of the active principle(s) following a possible compression step.