How did you stop recurrent UTIs?

Recurrent UTIs (meaning literally multiple UTIs per month) has never been an issue for me. I was always prone, but I’d get them maybe once or twice per year.

With my new partner, I’m getting them after every night we spend together. We’ve both been tested for all STIs (blood samples, urine samples, and swabs for me), and everything is negative, so I’m positive this is just a UTI.

I’ve visited the in person doctor twice to get antibiotics, but now I’m worried I need a third round within just one month.

For those of you who have struggled with this in the past- what did you do to successfully stop it. I’m drinking water, doing D-Mannose, peeing and cleaning myself after each session, and using a peri bottle after each session. I don’t know what else to do.