Bottom Line

Cosentyx is a prescription medication that is used to treat plaque psoriasis, psoriatic arthritis, ankylosing spondylitis, and other conditions. Cosentyx must be injected subcutaneously (under the skin) every four weeks after an initial loading dose, but most people can be taught how to self-administer either the Sensoready pen or prefilled syringe. The most commonly reported side effects are nasopharyngitis and an increased risk of infection.