How many capsules of Norfloxacin 0.1g for adults should be taken at one time cannot be generalized, and should be taken in different doses depending on different diseases. Norfloxacin is a common antibiotic, mainly used for the treatment of urinary tract infections, gonorrhea, prostatitis, intestinal infections, as well as typhoid fever and other salmonella infections, the drug is taken depending on different diseases. 1. Urinary tract infections: For acute simple lower urinary tract infections caused by Escherichia coli and Proteus mirabilis, usually 4 capsules once, twice a day. For simple urinary tract infections caused by other pathogenic bacteria, 4 capsules once, twice a day is also recommended. For simple streptococcal urethritis, it is recommended to take 8 to 12 capsules at a time. 2. Prostatitis: For acute and chronic prostatitis, 4 capsules are recommended twice a day. 3. Intestinal infections: for acute diarrhea, 3-4 capsules are recommended once, twice a day. 4. Salmonella typhi infection: it is recommended to take 8-12 capsules a day in 2-3 times. Nausea and vomiting may occur after Norfloxacin is taken in one large dose. During the treatment, you should eat a light diet, drink plenty of water and don’t eat stimulating food. Taking Norfloxacin needs to follow doctor’s advice to avoid potential health risks caused by self-medication.