I would advice you to take a prophylactic prolonged dose of antibiotic depending on your urine culture results as they are recurrent. Also drink at least 2.5 litres of water daily and you can take Cranmed capsules twice daily which contains Cranberry juice that has got good antiseptic effects on the bladder. In cases of recurrent infections it is always advisable to get a Ultrasound scan of Kidney, Ureter, Bladder done to rule out any anatomical abnormalities.