They can try something else and hopefully it won't make you feel so bad.
Most common antibiotics used to treat
UTI's are: Macrobid, Augmentin, Cipro, Amoxicillin, etc. It really depends on the type of bacteria that is present in the urinary tract. In general, Macrobid (Nitrofurantoin), is used specifically to treat UTI's.
Holding your urine too long can cause you to have a UTI or urethritis.
Also, having the urge to urinate frequently can be a sign of overactive bladder or a UTI.