Of the DMARDs, methotrexate (Rheumatrex) is the most widely prescribed. It is indicated for the treatment of rheumatoid arthritis and psoriasis; it is also used for psoriatic arthritis, systemic lupus erythematosus, and sarcoidosis. It is generally as efficacious as the other agents, with a low incidence of serious side effects when prescribed on a low-dose weekly schedule. Additional uses of methotrexate as an anticancer and immunosup-pressive agent are described in Chapters 56 and 57, respectively.
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