Mary Beth Nierengarten is a freelance medical journalist based in St. Paul, Minn.
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Methotrexate (MTX) remains the predominant medication used by rheumatologists to treat rheumatoid arthritis (RA). Doses of 7.5–25 mg per week with daily folic acid are generally prescribed. Despite its common use, MTX must be prescribed cautiously given the potential adverse effects when taken incorrectly or without folic acid supplementation. Cases of MTX-induced cutaneous ulceration have…