Suggest Treatment For Recurring Bladder Infection

I have had recurring bladder infections for almost a year. During this time I have had 6 treatments using cipro sometime for 10 days and up to 21 days. I have these treatments and around 5 to 10 days after my treatment session I have a recurrence. I am to start my next session soon for I waited 10 days after my last treatment with cipro for 10 days and began having the same symptoms again. I am becoming very concerned! Do you have any ideas or suggestions?