Last year I wound up treating SIBO indirectly.
after I tested positive via the breath test, my GI prescribed xifaxin, but insurance denied it.
While waiting for the appeal, at the same time I was being treated for a recurring unrelated UTI.
I took Bactrim for over a month and both UTI and SIBO were cured (at least for that moment).
when I told my GI, he was not surprised as his treatment protocol is xifaxin, doxycycline and then Bactrim.