What stomach-related side effects can happen with Cosentyx (secukinumab)?
Cosentyx (secukinumab) can cause gastrointestinal (stomach) symptoms in some people. The most commonly reported stomach-related issues include nausea and diarrhea, which show up in product safety information and prescribing details for the drug.
Do clinical studies or safety information report nausea, diarrhea, or indigestion?
Yes. Safety information for Cosentyx includes gastrointestinal events such as diarrhea and nausea among reported adverse effects. If you are noticing symptoms like ongoing diarrhea, nausea, or stomach upset after starting Cosentyx, it is reasonable to ask your prescriber whether the timing fits your starting dose and schedule.
When should stomach symptoms be treated as urgent?
Get medical care urgently if you have any red-flag symptoms along with stomach complaints, such as:
- Severe or worsening abdominal pain
- Blood in stool, black/tarry stools
- Signs of dehydration (dizziness, fainting, very low urine output)
- High fever with diarrhea
These can indicate a more serious condition than a mild medication side effect.
Could it be an infection instead of the medicine itself?
Diarrhea and stomach upset can also come from infections (including gut infections). Because Cosentyx affects parts of the immune system, any new gastrointestinal symptoms should be discussed with a clinician—especially if they are persistent, severe, or come with fever.
What can you do if you’re getting stomach symptoms?
Talk with your prescriber before stopping Cosentyx. They may suggest supportive care (like hydration and diet adjustments) and check whether the symptoms line up with dosing. They can also assess for other causes (infection, diet-related triggers, other medications).
What details would help your doctor decide if it’s likely from Cosentyx?
If you message your prescriber, include:
- When symptoms started relative to your first dose or dose changes
- How many days it lasts each time
- Severity (mild, moderate, severe)
- Any fever, blood in stool, or severe pain
- Any other new meds or recent travel/food exposures
If you tell me what specific stomach symptom you’re noticing (for example, nausea vs diarrhea vs cramps), how long it’s been happening, and whether you have fever or blood in stool, I can help you think through what’s most concerning and what questions to bring to your clinician.