Metronidazole tablets are used to prevent and treat infections caused by anaerobic bacteria, such as respiratory tract, digestive tract, abdominal cavity and pelvic cavity, skin and soft tissue, bones and joints, endocarditis, septicemia and meningitis caused by Bacteroides fragilis, and are also widely used to prevent and treat oral anaerobic bacteria infections. This medicine can also be inserted into the vagina, but it is recommended to use it under the guidance of a doctor. It is also used to treat intestinal and parenteral amebiasis, such as amebic liver abscess and pleural amebiasis. It can also be used for treating trichomoniasis vaginalis, pouch disease, cutaneous leishmaniasis, guinea worm infection, etc. At present, it is also widely used to treat anaerobic infection. The most common adverse reactions are digestive tract reactions, including nausea, vomiting, loss of appetite and abdominal cramps, which generally do not affect the treatment. Symptoms of nervous system include headache, dizziness, occasional paresthesia, numbness of limbs, ataxia and polyneuritis, and large doses can cause convulsions. A few cases have urticaria, flushing, itching, cystitis, dysuria, metallic taste in the mouth and leukopenia, all of which are reversible, and they will recover by themselves after stopping taking the medicine.