Generally, bismuth potassium citrate granules, amoxicillin, rabeprazole sodium enteric-coated tablets and levofloxacin hydrochloride tablets can be used together for eradicating gastritis and gastric ulcers caused by Helicobacter pylori bacteria, but they need to be divided into taking them before and after meals. Helicobacter pylori is a kind of micro-anaerobic rod-shaped curved bacteria with bluntly rounded ends, which can survive in the stomach, especially in the pyloric part of the gastric sinus, and can cause gastritis, gastric and duodenal ulcers and other diseases, resulting in gastric pain, bloating, nausea, vomiting, acid reflux, heartburn, and loss of appetite and other symptoms. At present, four combinations of drugs are often used in clinical practice to eradicate H. pylori, with a specific program of 1 proton pump inhibitor + 1 bismuth + 2 antibiotics used in combination for 14 days. Proton pump inhibitors can choose rabeprazole, lansoprazole, epprazole, etc., rabeprazole sodium enteric-coated tablets should be taken in the morning, before meals; bismuth agent for bismuth potassium citrate, bismuth pectin, etc., bismuth potassium citrate particles should be taken half an hour before meals and before bedtime with boiled water. Antibiotics can be chosen as levofloxacin, clarithromycin, amoxicillin, metronidazole and so on. Levofloxacin Hydrochloride tablets should be taken after meals, and Amoxicillin can be taken on an empty stomach or after meals and with food such as milk. It should be noted that all of the above drugs should be used under the guidance of a doctor and should not be taken without authorization.