Common Side Effects of Cosentyx
Cosentyx (secukinumab), an IL-17 inhibitor used for conditions like psoriasis, psoriatic arthritis, and ankylosing spondylitis—not specifically an "allergy treatment"—most often causes upper respiratory tract infections (14-18% of patients), diarrhea (up to 11%), and nasopharyngitis (cold-like symptoms). Injection site reactions, such as redness or itching, affect about 3-5%.[1][2]
Serious Risks and Warnings
Rare but severe side effects include increased risk of infections like tuberculosis or fungal infections (due to immune suppression), inflammatory bowel disease flares (Crohn's or ulcerative colitis in 1-2%), and hypersensitivity reactions like anaphylaxis (less than 1%). FDA warns of potential suicidal thoughts, neutropenia, and new psoriasis onset.[1][3]
Side Effects by Condition Treated
- Psoriasis/Psoriatic Arthritis: Diarrhea and oral herpes more common; uveitis (eye inflammation) in 0.1-2%.[2]
- Ankylosing Spondylitis: Similar profile, with higher candida infections (1-3%).[2]
No unique allergy-specific data, as it's not approved for allergies.
What Happens During Allergic Reactions to Cosentyx?
Hypersensitivity occurs in <1%, with symptoms like rash, swelling, breathing difficulty, or low blood pressure. Stop use and seek emergency care. Pre-treatment screening for TB/latex allergy (syringe component) is required.[1][3]
Managing and Reporting Side Effects
Mild effects often resolve without stopping treatment. Monitor for infections; report serious ones to FDA via MedWatch. Patient assistance programs cover monitoring costs.[1]
Comparisons to Similar Drugs
| Drug | Common Side Effects | Serious Risks |
|------|----------------------|---------------|
| Cosentyx | URI, diarrhea, injection reactions | IBD, infections |
| Stelara (ustekinumab) | URI, headache, fatigue | Infections, malignancy |
| Tremfya (guselkumab) | URI, headache, injection reactions | Infections, hepatotoxicity |
Cosentyx has higher diarrhea rates than Tremfya but lower malignancy signals.[2][4]
[1]: FDA Cosentyx Label
[2]: Cosentyx Prescribing Information
[3]: Drugs.com Cosentyx Side Effects
[4]: DrugPatentWatch.com - Secukinumab Competitors