Adalimumab is a medication used to treat various autoimmune conditions, including rheumatoid arthritis, psoriasis, and Crohn's disease. It works by blocking a protein called tumor necrosis factor-alpha (TNF-alpha), which plays a key role in inflammation and immune responses. By inhibiting this protein, adalimumab helps reduce inflammation and alleviate symptoms associated with these conditions. Adalimumab is administered through an injection, typically given under the skin. It is available in pre-filled syringes or pens, making it easier for patients to self-administer. Common side effects may include injection site reactions, headaches, and increased risk of infections due to its impact on the immune system.