You must additionally see a GP if you have signs of a UTI that haven't improved after a couple of days or if you have blood in your pee. Your antibiotic might need to be transformed after the very first day or two of treatment if laboratory examinations of the bacteria in your urine show a different antibiotic will certainly function better. If this is the instance, your healthcare supplier will inform you. Usually you will certainly require to take an antibiotic for a minimum of 7 days.