This site may be of interest:
https://www.chronicutiaustralia.org.au/Copied from NHS site -Treatment for UTIs that keep coming back
If your UTI comes back after treatment, or you have 2 UTIs in 6 months, a GP may:
prescribe a different antibiotic or prescribe a low-dose antibiotic to take for up to 6 months
prescribe a vaginal cream containing oestrogen, if you have gone through the menopause
refer you to a specialist for further tests and treatments
Chronic UTIs
In some people, short-term antibiotics for a UTI do not work and urine tests do not show an infection, even though you have UTI symptoms.
This might mean you have a chronic (long-term) UTI. This can be caused by bacteria entering the lining of the bladder.
Because urine tests do not always pick up the infection and the symptoms can be similar to other conditions, chronic UTIs can be hard to diagnose.
Chronic UTIs are also treated with antibiotics, which you may have to take for a long time.
Chronic UTIs can have a big impact on your quality of life. If you have been treated for a UTI but it keeps coming back, speak to your GP about chronic UTIs and ask to be referred to a specialist.
PMx