Have a google for Waterfall D-mannose - might be worth considering? It's a sugar that the bacteria that cause most UTIs 'like' more than your bladder wall, so the bacteria stick to the sugar in the urine (it passes through your kidneys) and are flushed out. I used to suffer from frequent, and persistant, UTIs but this stuff has worked really well for me (and I have no connection with the company!).