If getting continuous Urinary Track Infections, how can it be prevented. Also, I have had a serious side effect to one of the medications in the past and would like to know what yo do if it should occur again. At this time I have another UTI and was prescribed different medication, two hours after taking it I ate a couple of strawberries and immediately broke out in a itchy burning rash, what should I have done when something like this happens? How long does it take to have a bad reaction to medications prescribed for UTI's.