I went from Remicade to Cimzia after being on Cimzia for 8 months i was having severe reactions. I would get dizzy, my heart would race, and finally had seizures from it. I was taken off of it and was having no side effects. Although not being on any Chrohn's meds, I did find myself getting very sick. Wound up having half of my colon taken out, 2 emergency surgeries and wound up with an illiostomy, had 3 surgeries in 3 weeks. I am awaiting my take down surgery in July. You have to remember that everyone takes to meds different. If you feel anything weird stop and tell your dr. The Cimzia worked great up until the reactions started, and sometimes it takes up to 8 months before you will see any side effects. You know your body, I am sure you will do what is right for you.