Anti-HP means eradication of Helicobacter pylori, HP or Helicobacter pylori, a bacterium that is parasitic in the pylorus of the gastric sinus and is damaging to the gastric mucosa. This bacterium is very vigorous and can cause erosion of the gastric mucosa and even ulcers, which in severe cases can lead to gastric cancer if left untreated. When this bacterial infection is present along with damage to the gastric mucosa above the level of erosion, the bacteria needs to be killed. Clinically, three or four drugs are often used in combination for eradication, and the general course of treatment is 14 days. The combination of three drugs is called triple therapy, and the combination of four drugs is called quadruple therapy. The commonly used quadruple therapy is the combination of amoxicillin, clarithromycin, colloidal bismuth plus omeprazole. 14 days is a course of treatment, and after 14 days of eradication, the carbon 14 breath test is repeated for 14 days to clarify whether H. pylori has been eradicated.