My mother has stage 4 kidney deficiency. I took her to urgent care on Sunday to see if she had a urinary tract infection. She had a few white blood cells, trace of blood in urine. They couldn t visualize any bacteria but sent it for a culture which will be back in a day or so. The doctor prescribed nitrofurantoin mono/mac 100 mg twice a day. My mother has stage 4 kidney deficiency and is 93 years old. She is usually prescribed Cipro or Cephalexin for a urinary tract infection which she hasn t had in a long time. ( She takes probiotics that have helped a great deal). I read that if you have severe kidney disease, not to take macrobid and I am concerned as to whether this antibiotic will hurt her kidneys. thank you (also, we live in Tucson which is dry)