The generic name of Metzelin is L-Glutamine Croconate Sodium, which is not recommended for long-term use.The drug belongs to the acid-producing drugs and anti-peptic ulcer drugs, and long-term use of the drug may aggravate the side-effect reactions and liver burden. L-Glutamine quinacrine is a drug that inhibits the secretion of gastric acid, and is used clinically for peptic ulcers such as duodenal ulcers, gastric ulcers, etc. Sodium L-glutamine quinacrine may be associated with side effects such as nausea, vomiting, abdominal pain, diarrhea, constipation, and a feeling of fullness, as well as symptoms such as flushing of the face. In clinical practice, the exact duration of L-Glutamine Crotalate Sodium dosing is related to the type of disease, the patient’s condition, symptoms, age, and degree of response to the medication. Long-term administration of any drug is not recommended because the drug needs to be metabolized by the liver, and long-term administration may increase the metabolic burden of the liver with the adverse effects of the drug. L-Glutamine crotonate sodium needs to be used under the guidance of a professional doctor.