I bought OTC XO (?) strips to test urine when I suspect a UTI. Not 100% accurate, but has been great for me. Sometimes don't know if it's MS or UTI related. I take one 100Mg tab of NitroFurn Mono following intercourse and 2 daily for two days after intercourse "In case" as two have been related in past. I have a constant presciption of it. (hey, I'm married, we still have sex). But when I have suspicions of a UTI, have GCP send to lab to test urine also as sometimes a different antibiotic is needed . Since my "in case" dosing, UTIs went from very frequent UTIs to rarely.