The dosage of norfloxacin capsule use has different dosage and usage according to different diseases. In case of simple urinary tract infection, 1 dose of 0.4g is taken twice a day, and the course of treatment is around 3-7 days, and in case of complicated urinary tract infection, 1 dose of 0.4g is taken twice a day, and the course of treatment is extended to 10-21 days. In the case of simple gonorrheal urethritis usually take a single dose of medication, which is 0.8-1.2g for 1 oral dose for treatment. In case of acute and chronic prostatitis, the course of treatment should be longer, 1 dose of 0.4g, taken twice a day, for a course of 4 weeks. And if it is an intestinal infection, you can take 0.3-0.4g once, 2 times a day, and the course of treatment is about 1 week. The dosage for intestinal infection caused by Salmonella typhi should be larger, 0.3-0.4g for 1 time, 2-3 times a day, and the course of treatment should be about 2-3 weeks.