zithromax treatment for UTI

I was prescribed zithromax to treat a sinus/upper resporatory infection. The same day I began taking zithromax, I also began showing signs of a bladder infection. Went back to doctor the next day to confirm the UTI through dipstick testing of urine. He did not change my course of antibiotics and said that since it was bacterial, zithromax should clear it up. Nothing I have read about UTIs indicates that zithromax will clear up the UTI. I have taken zithromax for 2 days and have no improvement of the UTI. Is zithromax sufficient to treat it? And what should I do?

Thanks
--concerned in VA

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