The present invention relates to a granulate of gamma-hydroxybutyric acid or one of its pharmaceutically acceptable salts, characterised in that it comprises a solid core on which is supported the gamma-hydroxybutyric acid or one of its salts.本發明係有關一種γ-羥基丁酸或其醫藥上可接受的鹽類之一的顆粒,其特徵為其包含固體核心,該固體核心上支撐著該γ-羥基丁酸或其鹽類之一。