Methotrexate is a potent chemotherapy medication used to treat various types of cancer, including breast cancer, leukemia, and lymphoma. It works by slowing the growth of cancer cells and suppressing the immune system to reduce inflammation in autoimmune diseases like rheumatoid arthritis. This 2.5MG tablet is prescribed for both cancer treatment and immune system modulation. Always follow your doctor's dosage instructions and attend regular monitoring appointments.