The invention concerns a novel formulation for prolonged release of an active principle having a pH-dependent solubility. The inventive formulation comprises a matrix support based on hydrophilic polymer containing a specific dose of active principle, and further comprises one or more acidifying agents in the form of an acid salt of an organic acid.本發明係關於一種新穎調配物,可用於使具有pH值依賴性之溶解性之活性成份延長釋放。本發明之調配物包含基於親水性聚合物的基質賦形劑(其中含有指定劑量之活性成份),且亦包含一或多種呈有機酸之酸式鹽形式的酸化劑。