Benlysta Side Effects

Generic name: belimumab

Medically reviewed by Philip Thornton, DipPharm. Last updated on May 16, 2024.

Note: This document provides detailed information about Benlysta Side Effects associated with belimumab. Some dosage forms listed on this page may not apply specifically to the brand name Benlysta.

Applies to belimumab: powder for solution, solution.

Serious side effects of Benlysta

Along with its needed effects, belimumab (the active ingredient contained in Benlysta) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking belimumab:

More common side effects

• bladder pain
• bleeding, blistering, burning, coldness, skin discoloration, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site
• bloody or cloudy urine
• body aches or pain
• chest pain or tightness
• chills
• cough
• cough producing mucus
• diarrhea
• difficult, burning, or painful urination
• difficulty with breathing or swallowing
• dizziness
• ear congestion
• fever
• frequent urge to urinate
• headache, severe and throbbing
• hives, skin rash
• itching, pain, redness, swelling, tenderness, or warmth of the skin
• joint pain
• loss of appetite
• lower back or side pain
• muscle aches and pains
• nausea
• pain or tenderness around the eyes and cheekbones
• puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
• sneezing
• sore throat
• stuffy or runny nose
• sweating
• swelling of the eyes, face, or inside of the nose
• trouble breathing
• unusual tiredness or weakness
• vomiting

Less common side effects

• black, tarry stools
• blood in the urine or stools
• discouragement
• fast heartbeat
• feeling sad or empty
• hoarseness
• irritability
• loss of interest or pleasure
• painful or difficult urination
• pale skin
• pinpoint red spots on the skin
• sores, ulcers, or white spots on the lips or in the mouth
• tender, swollen glands in the neck
• trouble concentrating
• trouble sleeping
• unusual bleeding or bruising
• voice changes

Other side effects of Benlysta

Some side effects of belimumab may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common side effects

• arm or leg pain

Less common side effects

• stomach pain

For healthcare professionals

Applies to belimumab: intravenous powder for injection, subcutaneous solution.

General adverse events

The most common adverse events were nausea, diarrhea, pyrexia, nasopharyngitis, bronchitis, insomnia, pain in extremity, depression, migraine, pharyngitis, and injection-site reactions (subcutaneous administration).^[Ref]

Dermatologic

• Common (1% to 10%): Skin reactions, rash, urticaria, acne
• Uncommon (0.1% to 1%): Angioedema
• Frequency not reported: Cellulitis

Gastrointestinal

• Very common (10% or more): Nausea (up to 15%), diarrhea (up to 12%)
• Common (1% to 10%): Viral gastroenteritis, upper abdominal pain
• Frequency not reported: Vomiting

Obese patients (body mass index [BMI] greater than 30 kg/m2) with SLE treated with this drug administered IV reported higher rates of nausea, vomiting, and diarrhea compared with normal-weight patients (BMI 18.5 to 30 kg/m2); none of these gastrointestinal events in obese patients were serious.

Genitourinary

• Very common (10% or more): Urinary tract infection (UTI; up to 19.2%)
• Common (1% to 10%): Cystitis, bacterial UTI

Hematologic

• Common (1% to 10%): Leukopenia
• Frequency not reported: Myelosuppression

Cases of myelosuppression (including febrile neutropenia, leukopenia, and pancytopenia) were observed in patients who received induction therapy with cyclophosphamide followed by maintenance therapy with azathioprine, or mycophenolate.

Hypersensitivity

• Very common (10% or more): Hypersensitivity reactions (up to 13%)
• Uncommon (0.1% to 1%): Anaphylactic reaction
• Rare (0.01% to 0.1%): Delayed-type nonacute hypersensitivity reaction
• Postmarketing reports: Fatal anaphylaxis

In clinical trials of this drug administered IV in patients with systemic lupus erythematosus (SLE), hypersensitivity reactions (occurring on the same day of infusion) and anaphylaxis were reported in 13% and 0.6% of patients receiving this drug, respectively. Manifestations included hypotension, angioedema, urticaria/other rash, pruritus, and dyspnea.

Delayed-type, nonacute hypersensitivity reactions included symptoms such as rash, nausea, fatigue, myalgia, headache, and facial edema.

Local

• Common (1% to 10%): Injection-site reactions (subcutaneous formulations only)

In clinical trials of this drug administered subcutaneously in patients with SLE, injection-site reactions were reported in 6.1% of patients receiving this drug (plus standard therapy). These injection site reactions (most commonly pain, erythema, hematoma, pruritus, and induration) were mild to moderate in severity and most (94%) did not require discontinuation of therapy.

Musculoskeletal

• Very common (10% or more): Arthralgia (up to 16.2%)
• Common (1% to 10%): Pain in extremity, muscle spasms

Nervous system

• Very common (10% or more): Headache (up to 21.1%)
• Common (1% to 10%): Migraine

Oncologic

• Uncommon (0.1% to 1%): Malignancies (including nonmelanoma skin cancers)

Other

• Very common (10% or more): Infections (up to 82%), infusion-related events (up to 17%), serious infections (up to 14%), bacterial infections (e.g., bronchitis, UTI)
• Common (1% to 10%): Pyrexia, fatigue, infusion-/injection-related systemic reactions, postinjection systemic reactions, herpes zoster, death
• Uncommon (0.1% to 1%): Fatal infections, all-cause mortality, serious infusion reactions, serious opportunistic infections

In clinical trials of this drug administered IV in patients with SLE, infusion-related events (occurring on the same day of infusion) were reported in 17% of patients receiving this drug. Serious infusion reactions (excluding hypersensitivity reactions) were reported in 0.5% of patients receiving this drug and included bradycardia, myalgia, headache, rash, urticaria, and hypotension. The most common infusion reactions were headache, nausea, and skin reactions.

Infusion- or injection-related systemic reactions included a group of terms and manifested as a range of symptoms (including bradycardia, myalgia, headache, rash, urticaria, pyrexia, hypotension, hypertension, dizziness, and arthralgia); due to overlap in signs/symptoms, it was not possible to distinguish between hypersensitivity reactions and infusion- or injection-related systemic reactions in all cases.

Psychiatric

• Very common (10% or more): Psychiatric events (up to 16%)
• Common (1% to 10%): Insomnia, depression, depression-related events, anxiety, suicidal ideation/behavior, serious psychiatric events
• Uncommon (0.1% to 1%): Serious depression, serious suicidal ideation/behavior/self-injury without suicidal intent, suicidal ideation, suicidal behavior, suicide

Respiratory

• Very common (10% or more): Upper respiratory tract infection (up to 17.5%), cough (up to 12.5%)
• Common (1% to 10%): Nasopharyngitis, bronchitis, pharyngitis, sinusitis, influenza, viral upper respiratory tract infection
• Frequency not reported: Pneumonia

Frequently asked questions

• What is the difference between Benlysta and Saphnelo?
• What's the difference between Lupkynis and Benlysta?
• Does Benlysta cause weight gain?
• Where do you inject Benlysta?
• How long does it take for Benlysta injections to work?
• Can Benlysta cause an allergic reaction?
• How does Benlysta help lupus?
• How long does a Benlysta infusion take?
• Does Benlysta cause hair loss?

Further information

Benlysta side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

Medical Disclaimer