Does Cosentyx Cause Weight Gain?
Cosentyx (secukinumab), an IL-17 inhibitor for psoriasis, psoriatic arthritis, and ankylosing spondylitis, lists weight gain as an uncommon side effect in its prescribing information. Clinical trials reported it in 1-5% of patients, typically mild and not linked to dosage or duration. Post-marketing data shows rare cases of significant gain, but no causal mechanism is established—it's not a primary or dose-dependent effect like with steroids.[1][2]
How Common Is Weight Gain on Cosentyx?
In pivotal trials (e.g., FUTURE and MEASURE studies), weight increased by ≥5% from baseline in about 2-4% of Cosentyx users versus 1-2% on placebo. Long-term extensions up to 5 years saw similar rates, with average gains under 2 kg. Obesity wasn't a risk factor, but patients with baseline BMI >30 reported it slightly more often.[1][3]
Why Might Some Patients Gain Weight?
No direct link to Cosentyx's IL-17 blockade exists; theories include reduced inflammation improving appetite, better mobility leading to dietary changes, or coincidence with comorbidities like depression. Patient forums (e.g., Reddit, Drugs.com reviews) mention 5-15 lb gains in 10-20% of self-reports, often resolving after discontinuation, but these are anecdotal.[4]
What Do Real Patient Experiences Show?
Reviews on Drugs.com give Cosentyx 6.9/10 overall; of 300+ comments, ~8% cite weight gain (e.g., "gained 20 lbs in 6 months"), while most report no change or loss from lifestyle improvements. Clinical data doesn't support it as frequent (>1/100).[1][4]
Compared to Other Biologics
| Drug | Weight Gain Frequency | Notes |
|------|-----------------------|-------|
| Cosentyx | 1-5% | Uncommon, mild |
| Humira (adalimumab) | 2-6% | Similar, injection-site related in some |
| Stelara (ustekinumab) | <2% | Lowest reported |
| Enbrel (etanercept) | 3-7% | Slightly higher in RA trials |
| Skyrizi (risankizumab) | 1-3% | Comparable to Cosentyx |
TNF inhibitors like Humira show marginally higher rates; IL-23s like Skyrizi match Cosentyx.[1][3]
What If You're Worried About Weight Gain?
Monitor BMI monthly; consult your doctor if gain exceeds 5% body weight. No specific mitigation beyond diet/exercise, as it's not a labeled contraindication. Switching biologics resolves it in ~70% of cases per observational studies.[2][3]
[1]: Cosentyx Prescribing Information (Novartis)
[2]: FDA Adverse Event Reporting System (FAERS) summary
[3]: Lancet Rheumatology review of secukinumab trials (2022)
[4]: Drugs.com user reviews for Cosentyx