Metronidazole Tablet for Helicobacter pylori dosage is usually 0.4g. Metronidazole tablets are commonly used in the treatment of anaerobic infections, vaginal trichomoniasis and other diseases. The application of metronidazole tablets for Helicobacter pylori infection alone is not very effective, and can be combined with amoxicillin, clarithromycin and other drugs. The general dosage of metronidazole is 0.4g, 3 times a day. The specific dosage of the drug needs to be taken according to their own situation, as prescribed by the doctor, and not to increase the dosage on their own. The adverse reactions of metronidazole tablets are neurological symptoms, including headache, dizziness, occasional sensory abnormalities, numbness of the limbs, ataxia, polyneuritis, etc. Large doses can cause convulsions. It is contraindicated in active central nervous system disorders and hematologic disorders. It should also be contraindicated in pregnant and lactating women. The drug should be used under the guidance of a professional physician, and should not be used arbitrarily on its own.