After taking metronidazole, urine will often become deeper in color, similar to tea water, mainly because metronidazole excreted through the kidneys, so it will make the urine appear corresponding color changes, generally in 12 hours after stopping the drug will return to normal, so it is recommended to take metronidazole during the period must drink more water. Metronidazole is mainly for the treatment of anaerobic infections, and gynecological inflammation is mostly caused by anaerobic infections, metronidazole is also a gynecological drugs, it is recommended to drink more water when taking and take after meals. Because metronidazole can cause gastrointestinal reactions, such as nausea, vomiting, loss of appetite and other clinical symptoms, must be taken after meals. In addition, metronidazole should not be taken for more than a week, because the drug can kill white blood cells to reduce the body’s resistance.