The first of these is the use of the drug, which can be used to prevent the disease from worsening. 1, adverse reactions in the gastrointestinal tract, patients taking anti-Helicobacter pylori drugs will easily cause gastrointestinal discomfort, abdominal pain, diarrhea and nausea, some of which are caused by taking the drug and adverse reactions. The drugs are stacked and the chances of gastrointestinal discomfort are higher. 2, odor in the mouth, for example, taking clarithromycin may cause odor in the mouth. 3, anxiety or excessive excitement, after taking anti-H. pylori drugs, will play a role in the central nervous system, producing central nervous side effects. It can easily lead to excessive anxiety or excitement, and even headaches.