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How quickly does nitrofurantoin work for UTI?

How quickly does nitrofurantoin work for UTI?
Nitrofurantoin begins working within a few hours, but it should be taken for 5 to 7 days to fully treat an infection. Nitrofurantoin is a prescription antibiotic used to treat or prevent uncomplicated UTIs in adults and children age 12 years and older. View original source
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