Is rifaximin safe too take long term?

Since being on it ,it has greatly reduced my mcas/histamine intolerance, my histamine issues were so bad I had constant stress ,flight or fight and had too take antihistamines too sleep. Since being on rifaximin I sleep without antihistamines, and am not in flight or fight anymore. This drug has been a miracle for my histamine issues. My only symptoms remaining are diarrhea when I eat unhealthy and bloating if I eat strict