Metronidazole is a broad-spectrum antimicrobial agent, which has a very obvious therapeutic effect mainly for anaerobic bacterial infections, as well as for some protozoal disease infections. When to take metronidazole in clinical practice? The first is for toothache, when toothache, everyone knows to take metronidazole, also to prevent anaerobic bacterial infections. For gynecology, metronidazole is more often used in the treatment of pelvic inflammatory disease, because many pelvic inflammatory diseases are combined with anaerobic bacterial infections, metronidazole treatment can play a very good role. Another disease that is often treated with metronidazole in gynecology is trichomoniasis, and metronidazole is a very effective antibacterial drug. Metronidazole is a very effective antibacterial drug, but should never be taken by nursing mothers or pregnant women, because it can pass through the placental barrier to the fetus and enter the breast milk through the blood circulation, affecting the baby. Metronidazole should be used with caution in patients with poor liver function, because it is metabolized by the liver, and care must be taken when applying it to these patients. There are also some special diseases of the central nervous system, and patients with blood disorders should not take it. Therefore, although metronidazole is a broad-spectrum antimicrobial agent, its use must be under the guidance of a doctor in order to minimize its side effects or damage to the human body.