About Moderate to Severe Rheumatoid Arthritis (RA) Treatment ...Learn more about moderate to severe rheumatoid arthritis (RA), and how Enbrel (R) (etanercept) can help this disease of the immune system.Etanercept for rheumatoid arthritis - WebMD - Better information ...Drug details for Etanercept for rheumatoid arthritis. ... Etanercept is given as a shot under the skin (subcutaneous injection). How It WorksModerate to Severe Plaque Psoriasis and Rheumatoid Arthritis ...Enbrel (R) (etanercept) is treatment indicated for moderate to severe plaque psoriasis, psoriatic arthritis, and moderate to severe rheumatoid arthritis.