For UTI's in the past (all different doctors) I've used Cipro successfully twice and Macrobid unsuccessfully once. Now I've been blessed with another UTI and my current doctor is prescribing Bactrim. I told them about my history with Cipro working and Macrobid not. Any ideas on why they wouldn't just give me Cipro again? I don't think I'm a candidate for antiboitic resistance as the last time I used Cipro was over a year ago and the time before that was a year and a half ago. Is there anything new I should expect with Bactrim?