The main function of magnesium aluminum carbonate tablets is to neutralize gastric acid and protect the gastric mucosa. The main components of magnesium aluminum carbonate tablets are magnesium carbonate and aluminum hydroxide, this drug and stomach acid in the stomach chemical reaction. The main component of the stomach acid is hydrogen chloride, after the reaction to form aluminum chloride precipitation, magnesium chloride precipitation, as well as carbon dioxide and water, to neutralize a large amount of gastric acid in the stomach, but also to form a precipitation of aluminum chloride and magnesium chloride, can be uniformly sprayed on the mucosa of the stomach, to protect the role of the gastric mucosal barrier. It is useful for erosive gastric sinusitis, peptic gastric ulcer and gastric ulcerative complication of bleeding or atrophic gastritis. Therefore, it can be useful for some digestive system diseases, including gastroesophageal reflux disease.