Hello Dr. I'm A 2 Year Prostate Cancer Survivor Who

Hello Dr. I'm a 2 year prostate cancer survivor who has had a number of UTI's. I am now on my third series of antibiotics. Currently taking Cephelexin 500mg 4 times a day for 7 days. I looked on the net and many doctors prescribe Cipro of which I'm allergic. Please give me any advise that I can pass on to my doctors and any that I can use to help prevent further infections.
CBC