Trichomonas take metronidazole, usually need about 3 courses of treatment, 3 consecutive months to the hospital test negative, is considered a cure. The specific course of treatment is different from person to person, with the severity of the disease and the therapeutic effect of the relationship, it is recommended to follow the doctor’s advice. Metronidazole is used in the treatment of vaginal trichomoniasis, it is generally recommended that patients take 7 days as a course of treatment, usually need about 3 courses of treatment, at the same time, 3 consecutive months of negative tests, to be considered cured. Specific patients need to take how many courses of treatment, need to be based on the severity of the patient’s condition as well as the therapeutic effect achieved to decide, it is recommended that the specialist doctor according to the changes in the patient’s condition to determine the specific course of treatment. The more common adverse reactions to metronidazole include nausea, vomiting, flushing, headache, urticaria, loss of appetite, and abdominal cramps. Metronidazole is contraindicated in patients with active central nervous system disorders, as well as in patients with blood disorders, and if the patient suffers from liver disease, the dose needs to be reduced. In addition, Metronidazole carries certain risks and patients need to take it under the supervision of a specialist.