What side effects can Cimzia cause?
Cimzia (certolizumab pegol) can cause side effects ranging from common, mild reactions to serious immune-related problems. The most important risks involve infections and immune system effects.
Common side effects reported with Cimzia include injection-site reactions such as redness, swelling, pain, or itching. Other commonly reported effects include headache and upper respiratory symptoms (like runny nose or sore throat).
What serious side effects should you watch for?
Because Cimzia suppresses parts of the immune system, it can increase the chance of infections. Seek urgent medical care if you develop signs of infection, such as:
- Fever, chills, or feeling very unwell
- Persistent cough
- Shortness of breath
- Burning with urination
- Severe diarrhea
Serious reactions can also include:
- Allergic reactions (for example, swelling of the face or throat, trouble breathing)
- Tuberculosis (TB) reactivation or new TB infection
- Hepatitis or liver problems
Cimzia also has a boxed-warning–level concern for certain serious infections (including TB). Patients are typically screened for TB before starting therapy.
What are the risks with long-term use?
Long-term use of anti-TNF medicines like Cimzia is associated with ongoing infection risk. There is also an increased concern (compared with people not taking these medicines) about certain cancers, including lymphoma and skin cancers. Clinicians usually monitor for new symptoms such as unusual lumps, unexplained weight loss, or persistent skin changes.
How do side effects compare with other anti-TNF drugs?
Cimzia belongs to the anti-TNF class. Many side effects overlap across this class, especially injection-site reactions and infections. Differences between products are more about dosing schedules and specific labeling details rather than completely different side-effect categories.
What should you tell your doctor before starting or while taking Cimzia?
Tell your healthcare team if you:
- Have had frequent infections, TB exposure, or a past TB test result
- Have liver disease or abnormal liver tests
- Have a history of certain cancers or pre-cancerous skin lesions
- Take other medicines that affect the immune system (for example, steroids or other immunosuppressants)
When should you stop and get medical help?
Do not wait if you have symptoms that could signal a serious infection or an allergic reaction. Contact your prescriber promptly for urgent evaluation if you notice fever, severe infections, shortness of breath, signs of liver problems (yellow skin/eyes, dark urine), or swelling/hives with breathing difficulty.
If you share your age, whether you’re using Cimzia for Crohn’s disease, rheumatoid arthritis, psoriatic arthritis, or ankylosing spondylitis, and any symptoms you’re currently having, I can help you interpret which side effects are most likely and what to do next.