I took Entyvio while I had ulcerative colitis. Unfortunately it did not work for me.

I ultimately got a total procto colectomy. I reviewed the option of a j-pouch with my CR surgeon and specifically discussed the potential for pouchitis. He said they would treat it with antibiotics, with Flagyl (metronidazole) being preferred

So I am not sure why you would be considering Entyvio unless it is more than the typical pouchitis and perhaps involves UC or Chrohn's in the pouch?