Metzelin is the trade name, generic name L-glutamine sodium crotonate granules, mainly used for the treatment of duodenal ulcer, gastric ulcer, gastritis and other diseases, the drug side effects are may lead to constipation, diarrhea, nausea and other digestive system reactions, as well as allergic skin conditions and other adverse reactions. L-Glutamine Sodium Croconate Granules is a compound preparation consisting of L-Glutamine and Sodium Croconate as the main ingredients, which is commonly used clinically for the treatment of diseases such as gastritis, gastric ulcer and duodenal ulcer. The drug may cause nausea, bloating, abdominal pain, constipation, vomiting, diarrhea and other adverse reactions of the digestive system, if the symptoms are mild, can be relieved after stopping the drug. If taken by allergic individuals, allergic skin conditions such as urticaria, itchy skin, rash, etc. may occur. Once an allergic reaction occurs, the drug should be discontinued immediately, and the patient should go to the hospital immediately. Please use the drug under the guidance of a physician or pharmacist, do not use the drug on your own, so as not to cause adverse reactions.