I have suffered with cystitis for years and if I got a bad infection I was given antibiotics which gave me thrush...
The triggers are normally sex and sex with alcohol its guaranteed
I have been using a product Waterfall d-Mannose from Sweet Cures and this really helps the cystitis.
Their help/info is great and I take two tablets on the evening before sex and again the next morning and not had any infections for a while.
But
now my menopause symptoms have increased and VA is very bad I have noticed cystitis like aches, just been prescribed Vagifem.
I have over the last 3 yrs used Organic Coconut Oil as a lubricant daily and was slathering it on before sex. It is very anti bacterial etc I think that has helped also with preventing infections.
Its cheap and natural so feel safe with it but sadly its constant use so hoping the VAgifem is going to help but will still always use the coconut oil as a sex lubricant.
Might help.