Certolizumab Pegol is a medication used to treat autoimmune conditions such as rheumatoid arthritis, Crohn's disease, and psoriatic arthritis. It belongs to a class of drugs known as biologics, which work by targeting specific proteins in the immune system to reduce inflammation and prevent damage to joints and tissues. This drug is administered through an injection and is designed to provide long-lasting relief from symptoms. It is important for patients to discuss potential side effects and monitor their health with a healthcare provider while using Certolizumab Pegol.