The present invention is related to oral compositions comprising an irreversible gastric H+/K+-ATPase proton pump inhibitor (PPI) as a gastric acid secretion inhibitor and succinc acid as a parietal cell activator in the gastric lumen. The compositions of the present invention are capable of enhancing the anti-acid activity of PPI in the stomach. The present invention further relates to a method of using such compositions to reduce gastric acid secretion in a mammal.本發明係關於新穎的口服組合藥物,其中包含一不可逆的胃H+/K+三磷酸腺苷酶質子幫浦抑制劑(PPI),作為胃酸分泌抑制劑;及一或多種低級羧酸分子。本發明之組合物能夠提升PPI於胃中的抗酸效果。本發明進一步關於一種使用此種組合物以減少哺乳動物胃酸分泌之方法。