Methotrexate is a medication commonly used to treat certain types of cancer, autoimmune diseases, and ectopic pregnancies. It works by inhibiting the growth of rapidly dividing cells, which is why it is effective against cancer. Additionally, it helps reduce inflammation in conditions like rheumatoid arthritis and psoriasis. This drug can be taken orally or injected, depending on the condition being treated. While it can be very effective, methotrexate may also cause side effects, including nausea, fatigue, and increased risk of infections. Regular monitoring by a healthcare provider is essential to manage these risks.