Does Cosentyx (secukinumab) weaken the immune system?
Cosentyx is an immune-modulating medicine. It works by blocking interleukin-17A (IL-17A), a signal involved in inflammation in conditions like plaque psoriasis, psoriatic arthritis, and ankylosing spondylitis.[1] Because it changes immune signaling, it can increase the risk of certain infections, even though it is not described as a broad “immune suppressor” like some older immunosuppressive drugs.
What infections are patients most concerned about?
The most common infection-related concerns with IL-17 blockers like Cosentyx are:
- Fungal infections, especially oral or skin fungal infections (for example, candidiasis).[1]
- Respiratory infections, including upper respiratory tract infections.[1]
Cosentyx’s label warnings also note the need to consider the risk of infection and to monitor patients for signs of infection during treatment.[1]
Can it increase the risk of serious infections?
Blocking IL-17A can make infections more likely than with no treatment. How much risk rises varies by patient factors (age, other medications, existing infections, and overall health). The key practical point is that patients should contact their clinician promptly if they develop symptoms of infection while on Cosentyx.[1]
What about vaccines and immunity?
Because Cosentyx affects immune pathways, clinicians typically advise caution with live vaccines while a patient is taking biologic immunomodulators. Patients should discuss vaccination plans with their healthcare team before receiving vaccines.[1]
Does Cosentyx make you immunocompromised enough to avoid everything risky?
Cosentyx does not mean you must avoid all normal activities, but infection prevention matters more:
- Practice routine hygiene.
- Get medical advice quickly for fever, worsening cough, painful sores, or symptoms of fungal infection.
- Tell your prescriber about any history of recurrent infections or chronic infections before starting.[1]
If you tell me your age, diagnosis (psoriasis vs psoriatic arthritis vs ankylosing spondylitis), and any other medications (especially steroids or other immunosuppressants), I can help you gauge what “immune weakening” would realistically mean in your situation.
Sources
[1] https://www.drugs.com/cosentyx.html