Amoxicillin for urinary tract infection usually needs to be taken for 3-7 days to be effective. However, the exact duration of administration is related to the severity of the condition and the individual’s response to treatment, and is recommended to be determined by a specialist. Amoxicillin is used for infections induced by sensitive bacteria, it is an artificial semi-synthetic penicillin with broad-spectrum antimicrobial effect, which is useful for gram-positive cocci, such as streptococcus, enterococcus faecalis and staphylococcus aureus, etc., and also has a certain therapeutic effect on bacilli, such as Escherichia coli and variola. The common germs of urinary tract infection are E. coli and B. mutans, which can be relieved by taking medication, usually for about 3 days. However, if the urinary tract infection is recurrent, or complicated by factors induced by the urinary tract infection, you need to consider taking it for about 7 days. If symptoms do not resolve or tend to worsen after 7 days of treatment, you need to consult your physician for advice. Common adverse reactions to amoxicillin include nausea, vomiting, diarrhea, anemia, and rash, etc. It is contraindicated for those who are allergic to penicillin. In addition, the application of amoxicillin has certain risks, it is recommended that patients need to get the guidance of a specialist, not to take without authorization.