What Are the Long-Term Side Effects of Stelara?

Stelara is highly effective for many inflammatory conditions; its long-term effects on the immune system require careful monitoring. However, over time, some patients may experience recurring infections, weakened immune defense, or rare neurological complications. Understanding the possible Stelara side effects can help patients recognize warning signs early and discuss safer long-term treatment plans with their healthcare provider.

Common Side Effects of Using Stelara Long-Term

During long-term maintenance therapy, Stelara (ustekinumab) is generally well-tolerated, but some side effects may persist or gradually develop over time. This medication targets the IL-12 and IL-23 proteins involved in inflammation, which can also affect how the immune system responds to infections and other triggers.

• Nasopharyngitis: One of the most commonly reported effects, often causing sore throat, nasal congestion, or ongoing cold-like symptoms.
• Persistent Fatigue: Some patients experience ongoing tiredness or reduced energy levels during long-term treatment.
• Upper Respiratory Infections: Increased susceptibility to sinus infections, cough, or bronchitis may occur in some individuals.
• Injection Site Reactions: Redness, itching, swelling, or mild irritation around the injection area can develop after repeated doses.
• Recurring Headaches: Mild-to-moderate headaches are reported by some patients during maintenance therapy.

Rare but Serious Long-Term Risks of Stelara

Long-term use of Stelara may rarely increase the risk of serious infections and other immune-related complications, making regular medical monitoring important during treatment.

• Serious Infections: Stelara may increase susceptibility to infections, including tuberculosis (TB), pneumonia, fungal infections, and viral illnesses, which may require medical treatment or hospitalization. Screening for latent TB is commonly recommended before and during therapy.
• Potential Cancer Risk: Long-term immune suppression may slightly reduce the body’s ability to identify abnormal cells. Some studies have reported cases of non-melanoma skin cancer and other malignancies, although overall cancer rates remain relatively low.
• PRES (Posterior Reversible Encephalopathy Syndrome): This rare neurological condition can cause severe headaches, confusion, seizures, or vision changes and requires immediate medical attention.
• Lung Inflammation: Rare inflammatory lung conditions, including non-infectious pneumonitis, may develop during treatment and can present with persistent cough, chest discomfort, or shortness of breath.

Patients using Stelara long-term should seek medical attention for symptoms such as persistent fever, unexplained weight loss, breathing problems, or unusual neurological changes.

Who Is at Higher Risk of Stelara Long-Term Side Effects?

Certain factors may increase the risk of complications during long-term Stelara (ustekinumab) therapy:

1. Older Adults: People over the age of 60 may have a greater risk of serious infections or certain cancers during long-term treatment.
2. History of Infections or Cancer: People with recurrent infections, tuberculosis, or a history of malignancy may require closer medical monitoring while using Stelara.
3. Use of Other Immunosuppressants: Combining Stelara with medications such as corticosteroids or methotrexate can further weaken immune defenses and increase complication risks.
4. Previous Phototherapy Exposure: Individuals who previously received PUVA or extensive UVB phototherapy may face a higher risk of non-melanoma skin cancer.
5. Latex Sensitivity: The needle cover on some prefilled syringes might contain natural rubber latex, which can trigger allergic reactions in sensitive individuals.

Healthcare providers often review a patient's medical history, current medications, and infection risk before initiating long-term Stelara therapy.

How to Monitor and Manage Long-Term Side Effects of Stelara

Regular check-ups with your healthcare provider can help identify and manage Stelara side effects early before they become serious. Use this checklist to stay proactive during long-term treatment:

Is Stelara Safe for Long-Term Use?

Long-term studies on Stelara (ustekinumab) show a generally stable safety profile during ongoing treatment. This includes the five-year IM-UNITI trial for Crohn’s disease and the UNIFI long-term extension study for ulcerative colitis. Most patients do not develop new or worsening side effects over time, and serious complications remain uncommon with proper medical monitoring.

Studies also found that rates of serious infections, malignancies, and major adverse events were comparable to placebo groups in many patients. The most commonly reported long-term side effects were usually mild, including headache, joint pain, fatigue, and upper respiratory infections.

For many individuals with chronic inflammatory conditions, the long-term benefits of disease control and symptom remission may outweigh the potential risks. This is especially true when treatment is regularly supervised by a healthcare provider.

Key Takeaways on the Long-Term Side Effects of Stelara

Stelara remains a well-studied treatment for long-term management of Crohn’s disease, ulcerative colitis, and psoriasis. Clinical studies continue to show a generally stable safety profile over several years of use.

While mild side effects such as fatigue or infections may continue during treatment, serious complications remain uncommon with proper medical monitoring. Regular blood tests, TB screening, skin exams, and ongoing communication with your provider can help support safer long-term treatment outcomes.