Side effects of metronidazole usually recover on their own in about a week after stopping the drug, if the adverse reaction lasts too long, it needs to be taken seriously. Metronidazole is a commonly used drug for the treatment of anaerobic bacteria and trichomonas infections, mainly used for the treatment of trichomonas vaginitis, bacterial vaginosis and other gynecological diseases, but also used for the treatment of intestinal and extraintestinal amebiasis. Patients may experience side effects such as nausea, vomiting, loss of appetite, headache, dizziness, itching, difficulty urinating, loss of appetite, and abdominal discomfort while taking metronidazole. In general, most patients can relieve the adverse effects on their own after stopping metronidazole for about a week, but the exact time cannot be generalized due to individual variability. If the patient stops taking the drug, persistent adverse reactions or the degree is more serious, the cause of the disease should be identified in a timely manner. It is recommended that under the guidance of a physician to carry out metronidazole treatment, stop using metronidazole after the persistence of physical symptoms, should go to the regular hospital in a timely manner, for relevant examinations.