Can Cosentyx (secukinumab) cause weight loss?
Cosentyx (secukinumab) is an anti–IL-17A biologic used for inflammatory diseases such as plaque psoriasis, psoriatic arthritis, and ankylosing spondylitis. In the provided material, there is no direct, specific information linking Cosentyx to weight loss as a known effect or side effect.
Why do some people with psoriasis or arthritis lose weight while on Cosentyx?
Some weight change after starting Cosentyx may be indirect rather than from the drug itself. When inflammatory symptoms improve, people can sometimes become more active, adjust diet, or experience changes in overall health and appetite. If you are seeing weight loss, it’s still important to treat it as a symptom that should be explained clinically, especially if it’s unintentional.
What should you do if you are losing weight on Cosentyx?
If you are losing weight without trying (for example, losing pounds unintentionally over weeks to months), talk to your prescribing clinician. Unintentional weight loss can have many causes, including infections, other medication effects, changes in underlying inflammatory disease, or unrelated conditions that need evaluation.
When is weight loss a red flag?
Seek prompt medical advice if weight loss is accompanied by symptoms such as fever, persistent diarrhea, night sweats, trouble eating, worsening fatigue, or new or worsening pain, since those can point to causes that need treatment beyond adjusting Cosentyx.
Could other psoriasis drugs cause weight change instead?
Weight changes are sometimes reported with other treatments for psoriasis and related conditions, but the specific direction and likelihood depend on the medication and the individual. If you also take corticosteroids, methotrexate, JAK inhibitors, or other systemic therapies, those could be relevant to discuss with your clinician.
What to check at your next appointment
Ask your clinician whether the weight change could be related to:
- Your underlying inflammatory condition improving or changing
- Any other medicines or supplements you take
- Lab results that may explain weight loss (your clinician can decide which tests fit your case)
- Whether any adjustment to treatment is needed
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Sources: None provided in the question or prompt, so I can’t cite specific evidence about Cosentyx and weight loss from the materials available here. If you share what you’ve observed (how much weight, over how long, and any other symptoms), I can help you think through what to ask your doctor.