Methotrexate (rINN) (IPA: ), abbreviated MTX and formerly known as amethopterin, is an antimetabolite drug used in treatment of cancer and autoimmune diseases. It acts by inhibiting the metabolism of folic acid.

Methotrexate - Used alone or in combination with chemotherapies, surgery or radiation for treatment of cancers, lymphomas, leukemias, rheumatoid arthritis, and severe psoriasis. (Amethopetrin, Folex, Folex PFS)
Methotrexate - Familydoctor.org - Information for patients in English and Spanish.
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