Can cosentyx interfere with developing immunity from the flu shot?

Can Cosentyx affect how the body responds to flu shots?

Cosentyx blocks interleukin-17, a protein involved in inflammation and immune responses. This action can blunt some immune reactions, including the production of antibodies after vaccination. Studies show patients on Cosentyx produce fewer flu antibodies than people not taking the drug.

What happens if someone gets the flu shot while on Cosentyx?

The response to flu shots is weaker in patients taking Cosentyx. Data from clinical studies indicate lower seroconversion rates—the rate at which people develop protective antibodies—in Cosentyx users. However, vaccination still provides some protection, and guidelines recommend continuing annual flu shots for patients on Cosentyx.

Why does Cosentyx reduce vaccine effectiveness?

Cosentyx inhibits IL-17, which is part of the pathway that helps build immunity after vaccination. This is intentional for treating psoriasis, psoriatic arthritis, and ankylosing spondylitis, but it extends to other immune tasks like building defense against flu viruses. The drug does not kill white blood cells or make people completely unable to respond to vaccines.

When does the weakening effect show up?

The weakening effect appears during treatment and persists while Cosentyx is used. It does not require long-time use of the self-injectable weekly oder monthly injections. The effect is reversible once the drug stops, but stopping Cosentyx for vaccination purposes is not recommended by most clinicians.

What alternatives do patients on Cosentyx have for flu protection?

Patients on Cosentyx may benefit from high-dose flu vaccines or adjuvanted vaccines, which are designed to produce a stronger response. Some clinicians recommend checking antibody levels after vaccination to confirm protection.