Magnesium aluminum carbonate is a gastric mucosa protective class of drugs, used for the treatment of gastric and duodenal ulcers, acute and chronic gastritis, esophagitis, etc.. The side effects of magnesium aluminum carbonate are mainly the following: First, magnesium aluminum carbonate contains aluminum, which can be combined with other drugs, thus affecting the absorption and uptake of other drugs, so it can not be used simultaneously with tetracycline, iron preparations, digoxin, famotidine, ranitidine and other drugs, these drugs should be staggered with magnesium aluminum carbonate for one hour. Second, aluminum can adsorb bile salts, reduce vitamin, especially the absorption of fat-soluble vitamin A, easy to cause vitamin A deficiency. Third, a large dose of magnesium aluminum carbonate can lead to gastrointestinal discomfort, such as stomach pain, bloating, thin stools, etc. Fourth, a few patients taking magnesium aluminum carbonate during the itching of the skin, rash and other allergic reactions. Fifth, magnesium aluminum carbonate may cause high calcium, high magnesium, so high magnesium, hypercalcemia caution.