Bleeding after using metronidazole effervescent tablets may be caused by damage to the cervical mucosal tissue, or there is damage to the vaginal wall. If the amount of bleeding is relatively small, or there is blood in the secretion, it may be caused by drug stimulation leading to cervical mucosal tissue damage, usually pay attention to pubic hygiene, pay attention to change the underwear, observation can be. If the amount of bleeding is relatively large, you need to go to the hospital to improve the relevant examination to see whether there is improper operation, improper posture of the medication, resulting in vaginal wall damage caused. The use of metronidazole effervescent tablets should follow the doctor’s instructions. If there are any abnormalities during the use of the medication, it is recommended to consult a doctor in time to identify the cause and treat the symptoms.