Repeated UTI requires thorough investigations.
Rule out possibilities of diabetes
and any other malformation or obvious cause in urinary tract
Go for urine culture and sensitivity test.
Accordingly take antibiotic treatment along with alkalizer.
After complete course of antibiotic, select other antibiotic suitable for the infection from the sensitivity chart and take full course of it.
If no other abnormality is found in investigations, you can cure your UTI by this treatment only.