The more you use metronidazole, the more itchy you get may be due to the incorrect use of the medication, or it may be due to the development of an allergy. Due to the different causative organisms, vaginitis can be categorized into bacterial vaginosis, trichomonas vaginitis, and vulvovaginal pseudomycosis. Different causes of vaginitis use different drugs. If you use the wrong medication, not only will you fail to achieve the therapeutic effect, but you may also aggravate the symptoms. Metronidazole can be used for the treatment of bacterial vaginosis, trichomonas vaginitis, if the patient is vulvovaginal pseudomycosis, the use of metronidazole may worsen the condition, the more you use the more itchy situation. If the targeted use of the drug, but the more itchy situation, may be allergic to the drug, need to suspend the use of the drug. Patients using metronidazole more itchy, need to stop the drug in time, to the hospital for medical treatment. Usually the body abnormalities, but also not self-medication.