Rifaximin (Xifaxan)??

I saw my doc today and he prescribed Rifaximin (Xifaxan). As I browse the net a lot, my doc asked me not to search for this drug and not to ask him what's for, take it 3 times per day for 2 weeks and then report the results to him. Of course, I browsed the net and I found that it is prescribed for traveler's D and IBS and it necessitates that there is no blood with D.
I have read this name a lot in your posts but i don't know what's its relationship to Crohn's? Or are we going back to square1 and say that it is IBS? This contradicts with what he has told me regarding the narrowing of the anus as he thinks it's because of inflammation.
Your replies are highly appreciated.
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Current meds:
pred (tapering - 6.25 mg), Entocort (6mg), MTX 25 mg im inj/week, Pentasa (4g), Nexium 80, an anti-ulcer drug, folic acid, bi-weekly B shots, zofran inj (when needed) and a multivitamin.

Rootsmith,
Thank you. I understand why he said that as he has always a conviction that I get affected by whatever I read or hear about a drug. That is why he does not want me to investigate a drug. But that's not really me but I can't change his beliefs.

It is used off label for Crohn's. I have been on it for over 4 years. It cut the number of bathroom runs from 20+ to 5 - 8 a day. Basically it gave me back quality of life. I have no side effects from it. I take 550mg 2 X day.

One of the dr's I consulted with prescribed me Xifaxan for my SIBO, it did the trick. I didn't have any reaction or side effects on the 10 days I was on it.

I have taken Xifaxan on and off for 4 years for ulcerative colitis (pancolitis). It has worked quite well for me with no side effects, other than the cramping the first few days, which goes away. This drug makes me almost normal.