Infliximab is a chimeric, monoclonal antibody directed against TNF-α and is currently approved by the US Food and Drug Administration (FDA) to treat rheumatoid arthritis, ankylosing spondylitis, and Crohn's disease. Etanercept is a dimeric fusion protein consisting of the extracellular ligand-binding domain of the human TNF receptor linked to the Fc portion of human IgG1. Etanercept has been approved for the treatment of psoriasis, psoriatic arthritis, rheumatoid arthritis, and juvenile rheumatoid arthritis. Treatment with infliximab and etanercept was generally well tolerated and safe in these reports.