Metronidazole is used to treat symptoms of overactive bladder that includes increased or frequent urination, urgent need to urinate and inability to control urination. It helps to relax the muscle surrounding the bladder and increase it's ability to store urine. Metronidazole is advised to take it in a dose and duration as per prescription. It can be taken with or without food. Swallow the medicine as a whole without crushing or chewing it. You should not stop taking the medicine without consulting the doctor as it may lead to the worsening of your symptoms. The course of the treatment should be completed for better efficacy of the medicine..