Metronidazole can be used in the treatment of anaerobic bacterial infections. Periodontitis and apical periodontitis sometimes occur as a result of anaerobic bacterial infections, and their painful symptoms can be relieved after treatment with metronidazole tablets. 1. The main ingredient of Metronidazole Tablets is Metronidazole, the chemical name is 2-methyl-5-nitroimidazole-1-ethanol. It should be noted that metronidazole tablets are contraindicated in people with active central nervous system disorders and blood diseases. 2. The adverse reactions of metronidazole tablets are most common in the gastrointestinal tract, including nausea, vomiting, loss of appetite, abdominal cramps, neurological symptoms such as headache, vertigo, occasional sensory abnormalities, numbness of the limbs, ataxia, polyneuritis, etc., and convulsions can be caused by large doses. It is recommended to use drugs under the guidance of a doctor, not blindly self-medication. The therapeutic effect of drugs is limited, if the symptoms of toothache are serious, it is recommended to go to the hospital in time.