Penicillin series is also recommended to give up (only for Gram-positive bacteria), because Helicobacter pylori is Gram-negative bacteria, and since metronidazole has a high drug resistance rate, quinolones such as norfloxacin and levofloxacin have more obvious bactericidal effects now.
The four suggestions are bismuth (Livzondole) plus proton pump acid inhibitor (pantoprazole is the best, followed by omeprazole) for two weeks. The suggestion of two antibiotics is that clarithromycin+levofloxacin or norfloxacin (one week) should be taken for half an hour before eating, and then clarithromycin should be taken. Clarithromycin is basically useless in acidic environment. Pay attention to diet, don't eat acidic food, don't drink alcohol, smoke less (smoking stimulates gastric acid secretion), don't drink carbonated drinks, change your toothbrush and wash your hands frequently to avoid secondary infection, and drink water to boil (Helicobacter pylori can survive in tap water for 7 days). By hand, adopt it.