Metzelin refers to L-Glutamine Crotonate Sodium Granules, and taking this drug has no direct effect on checking for H. pylori. L-glutamine quinclorac sodium granules are mainly used for the treatment of gastritis, gastric ulcers and duodenal ulcers, can effectively protect the mucous membrane of the gastrointestinal tract, which belongs to the mucous membrane protective agent. In the process of use may cause constipation, diarrhea, nausea and vomiting and other symptoms. Therefore, it is forbidden to use the drug in people who are allergic to its components. Children, lactating women and pregnant women should be careful with the use of the drug. The main method of checking for Helicobacter pylori is the breath test, which effectively analyzes the presence of Helicobacter pylori infection by collecting the exhaled gas before and after taking the medicine. L-glutamine sodium crotonate granules do not stimulate or kill H. pylori, and do not inhibit the bacterial effect, so it will not affect the composition of the exhaled gas, and will not directly affect the effectiveness of the H. pylori test. Before the H. pylori test, you should consult your doctor in advance to stop taking bacteriostatic drugs and make good preparations for the test.