Norfloxacin for diarrhea caused by bacterial infections, the regular dosage for adults is usually 400mg once, two to three times a day, more serious can be increased appropriately. Norfloxacin is used for urinary tract infections, gonorrhea, prostatitis, intestinal infections and typhoid fever and other salmonella infections caused by sensitive bacteria, and the dosage of the drug is usually determined according to the severity of different diseases and infections. For diarrhea caused by intestinal infections, the usual dosage is one capsule (400mg) twice a day for 5-7 days; for diarrhea caused by typhoid salmonella infections, the dosage is one capsule two to three times a day for 14-21 days. The medication needs to be taken orally, with warm water. This drug may cause adverse reactions, the more common for gastrointestinal reactions, can be manifested as abdominal discomfort or pain, diarrhea, nausea, in addition to dizziness, headache, drowsiness or insomnia, as well as rashes, itchy skin and other allergic reactions, is prohibited in the person who is allergic to this product and fluoroquinolones. The use of medication needs to be under the guidance of a doctor, not self-medication, so as not to cause adverse consequences.