Hi Lauren,
I've been on a 14-day-course of Xifaxan/Rifaximin (and I started a thread as well, so -@Ronrush7, maybe it was me you were thinking of?) and it definitely DID make my Crohn's way way worse. Just to keep that in mind that this IS possible and I'm not the only one. At least one person out there (a friend of mine with Crohn's as well) was on Xifaxan for SIBO as well and felt much worse.
There is a trial for Xifaxan for Crohn's with a much higher dose for several months in different study centres in Europe and I'm super glad that I did not apply for it.
It gave me more and more stomach pain (as if my chronic gastritis flares up again as well, still eating dissolvable oats as porridge daily to help my stomach lining) the longer I was on it, slight indigestion but what really made me feel worse was diarrhoea, many many BM's (so much more than usual), constant need to go to the toilet (sometimes only mucus or just gas but felt like diarrhoea and was not), burning and stinging pain in mainly the colon area (left colon part, also right part), cramping, gurgling noise, a bit nausea, stomach and overall tummy pain after food (but not as bad as in my worst times when every bite of food hurt so badly).
So more or less felt like a flare-up getting worse.
It got way better two days after having stopped. So now my gut is still more sensitive but I feel that the probiotics help things to settle down, but I still feel more gassy but it doesn't really move (visibly bloated without the gas moving out). Fortunately I can see things improving slowly but bit by bit. Hopefully the 2 week course was enough to treat SIBO.
So, what about you, Lauren, how are you feeling on Xifaxan? How many days have you been on Xifaxan so far and how long will you be taking it?