Amethopterin is a chemotherapy drug and immune system inhibitor used to treat cancers of the blood, bone, lung, breast, head, and neck. In addition, it can treat rheumatoid arthritis and psoriasis.
Methotrexate monohydrate is a DHhF reductase inhibitor. Methotrexate monohydrate increases T cell apoptosis, decreases T cell activation and suppresses cytokine production.