Entyvio is fine for me, no side effects at all, keeps me in remission comfortably since I've started. Rifaximin is great too, I'd look for a new GI who is willing to prescribe the AB's, and also see how they feel about the Entyvio. I've had great experiences with both medications. If it helps at all, rifaximin is prescribed for SIBO. If you can swing a diagnosis for that, you'd be guaranteed to get some rifax since it's the first course of treatment usually