Cimzia (certolizumab) is a prescription drug used to treat plaque psoriasis, Crohn’s disease, and some types of arthritis, including rheumatoid arthritis. It’s given as an injection under the skin.

Rheumatoid arthritis (RA) is a type of arthritis that is considered an autoimmune disease. An autoimmune disease is when your immune system starts attacking your body. It causes pain and swelling in ...