Oh, no! I'm so sorry to hear about your back pain. Personally, I've never been prescribed Entyvio, so I can't offer experience with it. I do think you're following the right path by talking to your gastroenterologist. Each person's body responds differently to prescription medicines. I do hope your doctor is able to find the right prescription that offers UC relief without any major side effects. Until you return to the doctor, have you tried a heating pad or topical capsaicin patches (like Salonpas) for the back pain? Please stay in touch and let us know how you're doing. I do hope you are experiencing a pain-free day. Hugs! --Traci (UC-IBD Team Member)