There are bacteria that are resistant to nitrofurantoin. If your father is having fever, chills and back pain, it could indicate that the bladder infection has ascended to his kidneys which is a serious problem, esp in older persons. You need to take him to the ER for full evaluation and possibly IM or IV antibiotics. Make sure to tell the triage desk that your father has a UTI which has worsened.
Answered 9/8/2021
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His care needs to be escalated as pyelonephritis followed by sepsis becomes possible and time is of essence. Worries about COVID are legitimate, risk has to be assumed in the presence of a possible life threatening condition.
Answered 9/7/2021
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