Cipro is the antibiotic of choice when treating a UTI or bladder infection, if the infection isn't too serious. For a serious infection, the preferred antibiotic is Levaquin. Pretty powerful stuff.
My mother is prone to getting a UTI, and if she does, her doctor usually just gives her a round of Cipro, which clears it up quickly. You don't want to mess around with a UTI in an elderly person. Sometimes the only symptom they have is confusion and it can advance very quickly without showing other classic symptoms. Fortunately, the antibiotics usually get rid of it fairly quickly.