I appreciate your response. I developed c.dif after taking cefdinir for a UTI, then had a recurrence after taking fosfomycin. I just finished a two-week course of vancomycin hydrochloride. The worst seems over. The PA who had diagnosed the c.dif recommended Align pre-probiotic, an OTC with some fillers. The PA had also given me a low fiber diet that helped initially. I'm searching for a better way to avoid UTIs altogether but have tried many strategies. Part of problem is a prolapsed bladder supported by a pessary that doctors don't want to change often enough...I hope this is helpful.