Methotrexate is a generic drug prescribed to treat certain types of cancers, arthritis, and psoriasis in adults and some children. As with other drugs, methotrexate can cause side effects, such as ...

Methotrexate comes as an injection given under your skin or into your muscle. It also comes as a tablet you swallow and an intravenous (IV) infusion (an injection into your vein given over time). But ...