Metronidazole tablets are clinically best for the treatment of pelvic inflammatory disease. This is because pelvic inflammatory disease is overwhelmingly caused by anaerobic bacterial infections, and metronidazole is clinically the most effective against anaerobic bacterial infections. Metronidazole must be taken after meals during the medication period, as metronidazole can cause gastrointestinal reactions. It is recommended to take one tablet three times a day, and the medication should not be used continuously for more than seven days, because metronidazole can kill white blood cells and reduce resistance. In addition, patients with pelvic inflammatory disease must strengthen nutrition, eat more fresh fruits and vegetables in daily life, supplement vitamins and proteins, and take proper rest.