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Is Cosentyx a biologic / immunosuppressant?

Medically reviewed by Leigh Ann Anderson, PharmD. Last updated on July 19, 2025.

Official Answer by Drugs.com

Yes, Cosentyx is a biologic and immunosuppressant medicine used to treat plaque psoriasis, psoriatic arthritis, ankylosing spondylitis, and hidradenitis suppurativa, among other uses. Cosentyx can improve these medical conditions but can also lower your ability to fight infections because it is an immunosuppressant.

A biological medicine is a medicine made from a living substance like blood, proteins, viruses or other organisms. Biologics target proteins and other molecules in the immune system that cause inflammation, pain and joint destruction.

While an immunosuppressant drug can help relieve your pain and swelling, it can also weaken your immune system and increase your risk of infections. Because Cosentyx is an immunosuppressant, you should not take this medicine if you have any signs of infection unless you are instructed to do so by your healthcare provider.

If you have signs of any infection while taking Cosentyx (secukinumab), call your doctor right away.

Signs may include:

Cosentyx is given as a subcutaneous injection (under your skin) or intravenously (into a vein). Your healthcare provider will decide which type of Cosentyx is right for, and which dose you should receive. Intravenous (IV) Cosentyx is given by a healthcare provider, but most people can self-administer subcutaneous injections at home, or receive them from a caregiver.

Why is Cosentyx an immunosuppressant?

Immunosuppressants decrease the activity of the immune system, the disease and infection-fighting network in your body. Cytokines are small proteins that act as chemical signals between your white blood cells, that are used to fight infections. According to the American Cancer Society, cytokines also boost anti-cancer activity by sending signals that can help make abnormal cells die and normal cells live longer.

Cosentyx works by blocking the action of interleukin-17A (IL-17A), which is a cytokine. Blocking the action of cytokines may help with your disease symptoms like inflammation and pain, but can also increase your risk of infection.

Cosentyx (secukinumab) is an immunosuppressant prescription medicine approved by the FDA to treat:

Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease. People with HS may have swollen, painful bumps (nodules) and abscesses around the armpit area, groin, and inner thighs, on the buttocks and under the breasts. It tends to start in young people after puberty, can worsen and last for many years, and may worsen over time. You can learn more about HS by reading Is Cosentyx effective for Hidradenitis Suppurativa?

Because Cosentyx can increase your risk for infections, your doctor will monitor you and test you for tuberculosis (TB), a bacterial lung infection, before treatment. You should not use Cosentyx if you have an active TB infection or any signs of infection, unless instructed by your doctor.

Also tell your doctor if you have had many infections in the past, have tuberculosis (TB), have ever had TB, or have been in close contact with some with TB.

Tell your healthcare provider if you are taking any drugs used to suppress your immune system or if you are being treated for an infection. Ask your doctor or pharmacist if you are not sure.

This is not all the information you need to know about Cosentyx (secukinumab) for safe and effective use and does not take the place of your healthcare provider's instructions. Review the full product information and discuss this information and any questions you have with your doctor or other health care provider.

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