They prescribe Asacol for Ulcerative Colitis. Did they say that might be what you have?
Did they say why you have 'inflamed small intestine'?
Rifaximin is used for small intestinal bacterial overgrowth. There is a test for this and if I were you I would not take Rifaximin without working with your doctor on it.
are you losing weight and eating right, or are you not really eating right and losing weight.
If your losing weight and eating normally then that is a red flag.
I am not a doctor. All information I present is for educational purposes only and should not be subsituted for the advise of a qualified health care provider.
Please make sure you have your symptoms diagnosed by a medical practitioner or a doctor.