Some antibiotics will change the balance between your body's "good" bacteria and the "bad" bacteria that has caused your UTI. When this happens, an overgrowth of yeast can occur which may result in problems ranging from a skin rash to diarrhea. This can be prevented by taking acidophilus culture, which is available in some brands of yogurt, acidophilus milk, or as a pure culture (available in health food stores). If you develop any symptoms you think may be related to your antibiotic prescription, notify your health care provider.
When you have completed your antibiotic prescription, it is not necessary to get a repeat culture unless your symptoms have not improved. Those who reuse their intermittent catheters find that recurrence of a UTI is less likely if they discard their current catheters and begin using new ones after treatment for a UTI.