What side effects can happen after Simponi infusion?
Simponi (golimumab) can cause side effects typical of immunosuppressing biologics. Commonly reported issues include infusion-related reactions and infections.
Infusion-related reactions may include symptoms such as fever, chills, rash, itching, shortness of breath, or dizziness around the time of the infusion. Infections are also a key risk because Simponi can lower your immune response, increasing the chance of getting infections and making some infections worse.
What are serious Simponi infusion side effects that need urgent care?
Get urgent medical help if you develop signs of a severe allergic or infusion reaction, such as:
- Trouble breathing or swallowing
- Swelling of the face or throat
- Widespread hives
- Severe dizziness or fainting
Also seek urgent care for possible serious infections, especially if you have fever that persists, chills, severe fatigue, unexplained weight loss, or worsening symptoms that could point to pneumonia, tuberculosis, or other serious infections.
Can Simponi infusion make infections more likely?
Yes. Because Simponi affects the immune system, it can increase susceptibility to infections. Serious infections can occur in patients taking TNF-blocking medicines, so clinicians typically screen for risks (like tuberculosis and hepatitis) before starting and monitor during treatment. If you develop symptoms of infection while on Simponi, you should contact your healthcare team promptly.
What side effects are patients most concerned about?
Patients commonly ask about:
- Feeling unwell during or shortly after the infusion (reaction symptoms)
- Fever or infection symptoms after starting treatment
- Skin changes or rashes
- Worsening of pre-existing infections
If your symptoms match any possible infection or serious reaction, the safest step is to contact the prescribing clinician right away.
How soon do side effects show up after a Simponi infusion?
Infusion-related reactions usually occur during the infusion or soon after. Infection-related side effects can happen any time during treatment, so new fevers, cough, shortness of breath, or other infection symptoms should be treated as time-sensitive.
What increases the risk of side effects?
Risk is higher in people who:
- Have active or recent infections
- Have a history of tuberculosis exposure or untreated latent TB
- Have significant immune system issues or take other immunosuppressive medicines
- Have had prior serious reactions to biologic therapies
Your prescriber may adjust monitoring based on your medical history and current medications.
What should you do if you get a reaction during infusion?
Tell the infusion staff immediately if you feel unwell during the infusion. Many infusion reactions can be managed by stopping or slowing the infusion and using appropriate medications in a monitored setting. After any serious reaction, your healthcare team may decide whether to continue or switch therapy.
Does Simponi infusion have different side effects than the injection?
The underlying drug is the same (golimumab), so the immune-related risks overlap. The infusion route mainly adds an “infusion reaction” window, while injection-related routes can have local site reactions. Side effect types still center on infection risk and immune effects.
What to ask your doctor before continuing Simponi
Bring up specific symptoms you’ve had (timing, severity, fever status, and whether symptoms began during/after infusion). Also ask:
- Whether you were screened for TB/hepatitis before starting
- What symptoms should trigger stopping the next dose or calling urgently
- Whether you should pause treatment if you have an infection
Sources
I don’t have the specific Simponi infusion side-effect label text in the provided materials, so I can’t responsibly cite exact side-effect lists or percentages. If you share the Simponi prescribing information link/PDF (or paste the side effects section), I can extract the precise infusion-related and serious warning symptoms and present them accurately.