Quadruple therapy is mainly for Helicobacter pylori infection, which consists of proton pump inhibitors such as omeprazole, bismuth such as colloidal bismuth pectin, and two antibiotics such as amoxicillin and furazolidone, and the daily dosage of the four drugs is as follows: 1. Proton pump inhibitors: Omeprazole is generally preferred, and it is recommended to take 20 mg orally each time, once or twice a day, half an hour before meals. 2. Bismuth: the commonly used bismuth is colloidal bismuth pectin, and it is recommended to take 200 mg orally each time, three times a day, before meals. 3. Two kinds of antibiotics: currently recommended antibiotics such as amoxicillin and furazolidone, etc. Amoxicillin is 100 mg each time, twice a day, 1 hour after meals; furazolidone is 100 mg each time, twice a day, 1 hour after meals. The above drugs should be used under the guidance of a medical professional. Quadruple therapy is an effective and commonly used method to eradicate Helicobacter pylori, and it is usually taken for a period of 10~14 days, and it is recommended to consult a doctor in time if any discomfort occurs.