What is Methotrexate? Methotrexate interferes with the growth of certain cells of the body, especially cells that reproduce quickly, such as cancer cells, bone marrow cells, and skin cells. Methotrexate is used to treat certain types of cancer of the breast, skin, head and neck, or lung. It is also used to treat severe psoriasis and rheumatoid arthritis. Methotrexate is usually given after other medications have been tried without successful treatment of symptoms.
Methotrexate dosage. Methotrexate comes as oval-shaped, film-coated tablets in the following dosages:
- 5 milligram (mg)
- 7.5 mg
- 10 mg
- 15 mg
Dosage depends on the disease being treated. While taking Methotrexate, avoid sunlight or artificial ultraviolet rays, such as from sunlamps or tanning beds, especially if you have psoriasis.