Leflunomide and methotrexate are prescription drugs used to treat rheumatoid arthritis (RA). Methotrexate is also used to treat certain other conditions, including psoriasis. This article explains the ...

Methotrexate injection, a treatment for certain autoimmune diseases and cancers, can lead to various side effects. These range from common, mild reactions such as headache and nausea to serious, ...