Can Cosentyx (secukinumab) cause a flare or worsen inflammation?
Cosentyx is designed to reduce inflammatory activity in conditions such as plaque psoriasis, psoriatic arthritis, and ankylosing spondylitis, so it is generally used to prevent inflammatory flares rather than trigger them. Still, some people can experience worsening symptoms around the time of starting treatment, changing doses, or during gaps in therapy. This can feel like a “flare,” but it may reflect disease activity catching up, timing around the first doses, or other causes rather than a direct “flu-like flare” effect.
If symptoms suddenly worsen, the safest next step is to contact the prescribing clinician promptly, especially if there is fever, rapidly worsening pain, or signs of infection.
How does Cosentyx affect flu-like symptoms?
Cosentyx can cause side effects in some people, including infections. Flu-like illness (fever, chills, body aches) is also a common way infections can present. If you have flu-like symptoms after starting Cosentyx, the key concern is usually whether you have an infection that needs evaluation rather than a medication “flare” itself.
Does the timing of Cosentyx doses matter for “flare” symptoms?
Yes. For inflammatory arthritis and related conditions, symptoms may improve gradually, and early in treatment some patients notice transient worsening or “not-yet-better” symptoms. Also, missing doses can allow inflammation to return, which may look like a flare.
Could a flare be an infection instead?
Because Cosentyx affects immune signaling (interleukin-17), clinicians watch for infections. A flare-like pattern with flu symptoms (fever, sore throat, cough, burning with urination, etc.) can overlap with infection and should be assessed if it’s more than mild or lasts more than a short period.
What should you do if you’re getting flare symptoms while on Cosentyx?
- Contact your prescriber if symptoms worsen or you think you’re having a flare.
- Seek urgent care if you have high fever, shortness of breath, severe weakness, or rapidly worsening joint swelling or pain.
- Don’t stop Cosentyx on your own unless a clinician tells you to.
If you share which diagnosis you’re treating (psoriatic arthritis, ankylosing spondylitis, non-radiographic axial spondyloarthritis, etc.), when the symptoms started relative to your last dose, and what “flare” looks like (joints, rash, fever/flu symptoms), I can help you narrow what’s most consistent with a disease flare versus an infection.
Sources
No external sources were provided in your prompt, and I don’t have access to additional documents here. If you want, paste the specific info you’re looking at (or tell me where you saw “flare”), and I’ll interpret it.