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Did your doctor actually do a urine culture to identify the bacteria to see if it was sensitive to nitrofurantoin?
OK. The next step is for you to go back to your doctor to have a formal urine culture done. It sounds to me like you may have a residual infection and you need a urine culture to identify the bacteria. The lab report will then print out which antibiotics are appropriate for this infection. Your doctor can then pick one that you are not allergic to. Hope this helps and let me know if you have questions.