Abstract
Etanercept (Enbrel) and infliximab (Remicade) are two relatively new drugs, referred to as biologics, which target the cytokine tumor necrosis factor-α (TNF-α). Both are used in the treatment of psoriasis and psoriatic arthritis. Recently, there have been rare reports of demyelinating and neurological sequelae in patients while on these therapies. The authors sought to systematically review the reported cases of new-onset neurological symptoms and exacerbation of established multiple sclerosis (MS) found in the literature to determine the causality, if any, of demyelinating events by these therapies. Although these two medications may uncover latent multiple sclerosis in patients who are prone to the disease, no cause-and-effect relationship can currently be established.