Secukinumab is a medication used to treat autoimmune conditions such as psoriasis, psoriatic arthritis, and ankylosing spondylitis. It works by targeting and inhibiting a specific protein in the immune system called interleukin-17A, which plays a key role in inflammation and immune responses. Administered via injection, Secukinumab helps reduce symptoms like redness, swelling, and pain associated with these conditions. It is typically prescribed for patients who have not responded well to other treatments, providing an alternative option for managing chronic inflammatory diseases.