Morpholine guanidine hydrochloride tablet is an antiviral drug, which is mainly used clinically for influenza virus and herpes virus infections. Adverse reactions after the application of this product are mainly gastrointestinal symptoms, such as nausea, vomiting, abdominal pain, diarrhea, loss of appetite and indigestion, etc. It is recommended to apply after meals to reduce the above adverse reactions. In addition, some patients may experience excessive sweating, hypoglycemia, etc. during the course of administration. Generally speaking, the above reactions will disappear after stopping the drug and will not cause long-term damage. For patients with long-term heavy application, liver and kidney function may also be affected, so attention should be paid to regular monitoring. It should be noted that the adverse reactions and contraindications of this drug are not very clear, so patients are advised to apply it under the guidance of a doctor and not on their own.