I used to get UTIs in my 1st 5 years of MS, most sex related (I am married so this happens) but not all, I take Nitrofurn right after Activity, then 2x/day for 2 days, When I have a UTI, PCP does quick in office test strip, sends urine to a lab and sometimes Anti-biotic prescription (she calls) needs changing to be bacteria specific. One size (Or antibiotic) does NOT fit all.