Byfloxacin is an artificial quinolone antibiotic, although the instructions do not say the maximum number of days to take, but generally should not exceed 14 days, that is, a maximum of two weeks to take. The generic name of Byfloxacin is moxifloxacin hydrochloride, which is a broad-spectrum antibiotic with strong antibacterial activity for most gram-negative and gram-positive bacteria, and also has good effect on mycoplasma and chlamydia, and has a certain anti-tuberculosis effect, and is often used to treat respiratory infectious diseases, and also used to treat abdominal infections, urinary tract infections, pelvic infections and so on. For mild infections treatment for 3-5 days is sufficient, for moderate infections treatment time is 6-10 days, and for severe infections oral administration is not advocated, instead intravenous infusion is used to improve blood concentration and bioavailability. Therefore, the average duration of oral moxifloxacin hydrochloride is 6-10 days, with the longest not exceeding 14 days. The risks outweigh the benefits after too long a period of time, with the risk of drug resistance and adverse reactions increasing with time.