Yep. Been on Cipro, Bactrim, Ceftin and Doxy.
Doxy was the only one that helped me.
The DR that first scripted Doxy has been around and seen a lot.
Says 4 weeks at a min., 100mg time 2 per day, needed.
You have to get the antibiotics into ALL the nooks and crannies of the prostate to get it all.
If you miss a small dab of infection it will come back over time.
Said some folks that have chronic prostatitis end up on a maintenance dose of Doxy to keep from reoccurrence.
I had elevated PSA and went the route with the different antibiotics and for me at least it was the Doxy that worked.
I was checking my PSA on my own to track the impact of the antibiotics. All but the DOXY slowed it up a bit, but as soon as I stopped the infection ramped up along with the PSA.
The Doxy seemed to have worked as PSA dropped.
That's my story and I am sticking too it

BTW we do have URO that does answer basic general question here. You might ask him a basic question or 2.
You need to find a good DR that understand.