As Chapelle said - serious side effects with the fluoroquinolone class of antibiotics.
They come with a black box warning for tendon issues (including rupture)
Here is a link to a webinar on Bartonella that was posted a few months ago.
When I watched it, I had a lot of 'aha' moments...
This Dr. treats Bart with Rifampin and Biaxin.
www.galaxydx.com/web/2015/webinar-understanding-bartonella/