Magnesium aluminum carbonate, is a kind of gastric mucosa protective agent, its main representative drugs are Daxi. 1, its role is to neutralize gastric acid, can make 99% of gastric juice and neutralize gastric acid, so that pepsin inactivation, and its antacid effect is rapid mild and long-lasting. 2, magnesium aluminum carbonate can protect the gastric mucosa, it can increase the synthesis of prostaglandin, increase the role of gastric mucosal barrier, so that the release of endothelial factor of gastric mucosa, promote The synthesis of gastric mucosa. 3, magnesium aluminum carbonate can be combined with pepsin directly inhibit its activity, conducive to the repair of peptic ulcer surface, to prevent bile acids and other substances damage and destruction of gastric mucosa.