Lucky, I also had to stop Remicade due to allergic reactions so I was really scared when I started Cimzia. After a year on a clinical trial for that, I switched to Humira, which I have been on for 2 months. The only reaction I've noticed is an itchy, red injection site reaction that usually pops up the day after I inject. Benedryl or Zyrtec and cortizone cream haven't helped much, so my GI yesterday told me to also take Zantac or Pepsid a couple days before I inject and that seems to help for some reason. I figured that I would have worse reactions, but have done well. Oh, I do get fairly frequent upper respiratory infections, but you can get that with Remicade too. So yes, most of the side effects are the same, but I've had much much fewer ones with Cimzia and Humira than with Remicade (and I had less reactions to Cimzia than to Humira...no itchy injection site, just a whelp there with Cimzia). I hope Humira works well for you!
Crohn's Disease, Acid Reflux/Gastritis, Hashimoto's Thyroiditis, Endometriosis, Arthritis, Depression/Anxiety. Too many meds to list them all. =)