Lizudra, chemically known as bismuth potassium citrate, is a gastric mucosal protector that can be used to treat gastritis or peptic ulcer, gastroesophageal reflux disease, etc., because Lizudra can relieve stomach pain, bloating, acid reflux, heartburn and other symptoms caused by excessive stomach acid. However, Lizudra is a kind of bismuth agent, and patients are advised not to take it for a long time, and use it for no more than 7 days continuously, and no more than 14 days at the longest, in order not to cause bismuth poisoning, which is a kind of heavy metal poisoning. The blackening of stool in most cases of taking Lizudra is a drug effect, not a real black stool caused by gastrointestinal bleeding, so patients should also pay attention and not be overly nervous. Lizudra combined with acid suppressants is used to treat the above mentioned digestive system diseases. In the case of digestive disorders caused by H. pylori infection, acid suppressants combined with Rejuveno can be used, as well as two antibiotics. So gastritis patients who are taking Rizdal must pay attention to the problem of time, not more than 14 days, pay attention to the problem of adverse drug reactions, it is recommended that it is best to use specific drugs under the guidance of a doctor.