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Benlysta, known generically as belimumab, has emerged as a significant advancement in the treatment of systemic lupus erythematosus (SLE) and active lupus nephritis. It is the first medication approved specifically for lupus in several decades, offering new hope for patients who have struggled with limited treatment options. Benlysta targets the underlying disease mechanisms, aiming to reduce disease activity and improve clinical outcomes in lupus patients.

What is Benlysta?

Benlysta is a monoclonal antibody that inhibits the activity of B-lymphocyte stimulator (BLyS), a protein essential for the survival and proliferation of B cells, which are implicated in the pathogenesis of lupus. Classified as a biologic, it is used in patients aged 5 and above with active SLE or lupus nephritis who are receiving standard therapy. Notably, Benlysta is not recommended for patients with severe active central nervous system lupus.

Historical Development and FDA Approval Process

The development of Benlysta represents a breakthrough in lupus research, addressing a critical need for targeted therapies in this complex autoimmune disease. It was approved by the FDA based on the results of several clinical trials demonstrating its efficacy in reducing lupus symptoms and preventing disease flares. The approval marked a significant milestone, as it was the first new treatment approved for SLE in over 50 years.

How Medication Works

Mechanism of Action

Benlysta works by targeting and neutralizing BLyS, a protein that is found in higher levels in patients with lupus and is associated with B cell survival and activity. By inhibiting BLyS, Benlysta reduces the number of abnormal B cells thought to be a part of the lupus disease process. This mechanism helps in reducing the inflammation and autoimmunity that characterize lupus.

Role in the Immune System and Its Effects on Lupus

By modulating the immune system, specifically the B cells, Benlysta helps in managing the symptoms of lupus, including joint pain, skin rashes, and fatigue. It also plays a role in reducing the frequency of disease flares and may help in preventing or slowing down organ damage caused by the disease. Benlysta’s targeted approach offers a more specific treatment option compared to traditional immunosuppressive therapies.

Dosage and Administration

Standard Dosing Guidelines

Benlysta is administered in two forms: intravenous (IV) infusion and subcutaneous injection. The standard adult dose for systemic lupus erythematosus (SLE) via IV is 10 mg/kg over 1 hour at 2-week intervals for the first 3 doses and at 4-week intervals thereafter. For subcutaneous administration, the dose is 200 mg once a week in the abdomen or thigh, preferably on the same day each week. For lupus nephritis, the dosage is similar, with an initial 400 mg (two 200-mg injections) once a week for 4 doses, then 200 mg once a week thereafter.

Administration Methods and Best Practices

For IV administration, Benlysta is given slowly over about 1 hour by a healthcare provider. When transitioning from IV to subcutaneous administration, the first subcutaneous dose should be given 1 to 4 weeks after the last IV dose. For subcutaneous injections, patients may be taught to self-administer the medication. The medicine should not be injected into skin that is bruised, tender, red, or hard. It’s important to follow the Instructions for Use provided with the medication and to use each prefilled syringe or injection pen only once.

Side Effects of Benlysta

Serious Infections

  • Benlysta can lead to serious, sometimes fatal infections. Patients should be cautious, especially if they have a history of chronic infections.
  • Symptoms of serious infections include fever, chills, cough with mucus, skin sores, warmth or redness under the skin, increased urination, or burning when urinating.

Progressive Multifocal Leukoencephalopathy (PML)

  • There have been cases of JC virus-associated PML, a rare and often fatal brain infection, in patients taking Benlysta. Symptoms include neurological deficits, and if confirmed, treatment with Benlysta should be stopped.

Hypersensitivity Reactions

  • Acute hypersensitivity reactions, including anaphylaxis and death, have been reported. These reactions can occur within hours of the infusion and sometimes days later, even in patients who have previously tolerated Benlysta.
  • Non-acute hypersensitivity reactions, such as rash, nausea, fatigue, myalgia, headache, and facial edema, typically occur up to a week after infusion.

Depression and Suicidality

  • Depression and suicidal thoughts and behaviors have been reported in patients receiving Benlysta. Patients should be monitored for new or worsening depression and suicidal thoughts or behavior.


  • The use of immunosuppressants, including Benlysta, may increase the risk of developing malignancies. The impact of Benlysta on the development of malignancies is not fully known.


  • Live vaccines should not be given for 30 days before or concurrently with Benlysta, as clinical safety has not been established.

Use with Other Biologic Therapies

  • Concomitant use of Benlysta with rituximab or other biologic therapies, including B-cell-targeted therapies, is not recommended due to an increased incidence of serious

infections and post-injection systemic reactions. The safety and efficacy of such combinations have not been established, and caution should be exercised.

Additional Adverse Reactions

  • In clinical trials, the most common serious adverse reactions in adult SLE patients were serious infections, some of which were fatal.
  • Other common adverse reactions (occurring in ?5% of patients) include pain in extremity, depression, migraine, pharyngitis, and injection site reactions for subcutaneous injections.
  • Adverse reactions in pediatric patients (?5 years) and adult patients with lupus nephritis were consistent with those observed in adult SLE trials.

Special Considerations for Specific Populations

  • Pregnancy: Insufficient data exist to establish drug-associated risks for major birth defects or miscarriage. Women of childbearing potential should use effective contraception during treatment and for at least 4 months after the final dose.
  • Breastfeeding: It is unknown if Benlysta passes into breast milk. Nursing mothers should consult their healthcare provider.

Reporting of Adverse Reactions

  • Patients and healthcare providers are encouraged to report negative side effects of prescription drugs to the FDA.

Warnings & Precautions for Benlysta


  • Benlysta is contraindicated in patients with a history of anaphylaxis to belimumab.
  • It is not recommended for use in patients with severe active central nervous system lupus due to the lack of safety data in this subgroup.

Precautions for Specific Patient Groups

  • Pregnant Women: The safety of Benlysta in pregnant women is not fully established. Women of childbearing potential should use effective contraception during treatment and for at least 4 months after the last dose. If a patient becomes pregnant while receiving Benlysta, they should consider enrolling in the BENLYSTA Pregnancy Registry.
  • Elderly Patients: Older patients may have a higher risk of infections. Close monitoring and caution are advised when treating elderly patients with Benlysta.
  • Breastfeeding: It is not known if Benlysta is excreted in human milk. Nursing mothers should be advised to either discontinue breastfeeding or discontinue the drug, taking into account the importance of the drug to the mother.

Additional Precautions

  • Infections: Patients should be monitored for signs of infection, as Benlysta can increase susceptibility to infections, including serious and sometimes fatal infections.
  • Mental Health: Patients should be assessed for depression and suicidality before starting Benlysta and monitored for new or worsening symptoms during treatment.
  • Immunizations: Live vaccines should not be given concurrently with Benlysta or within 30 days before starting treatment.
  • Use with Other Biologic Therapies: Caution is advised when using Benlysta with other biologic therapies, as the safety and efficacy of such combinations have not been established.
  • Cancer Risk: As with other immunosuppressants, there may be an increased risk of malignancy with Benlysta. The impact on the

development of malignancies is not fully known, and patients should discuss the potential risks with their healthcare provider.

Progressive Multifocal Leukoencephalopathy (PML)

  • Patients should be informed about the signs and symptoms of PML, a rare but serious brain infection that can result in death or severe disability. If PML is suspected, Benlysta should be discontinued.

Hypersensitivity Reactions

  • Patients should be aware of the possibility of hypersensitivity reactions, including anaphylaxis. These reactions can occur within hours of the infusion and sometimes days later. Immediate medical attention should be sought if symptoms of a serious allergic reaction occur.

Monitoring and Laboratory Tests

  • Regular monitoring of patients, including laboratory tests, is recommended to detect any early signs of adverse reactions or infections.

Drug Interactions

  • Patients should inform their healthcare providers about all the medications they are taking, as Benlysta may interact with other drugs, potentially altering its effectiveness or increasing the risk of adverse effects.

This expanded content provides a more comprehensive overview of the warnings and precautions associated with the use of Benlysta, including detailed information on contraindications, precautions for specific patient groups, and additional safety considerations. It is crucial for patients and healthcare providers to be aware of these details to ensure safe and effective use of the medication.


Potential Drug Interactions with Benlysta

Benlysta, as an immunosuppressive agent, can interact with various medications. It is important to inform healthcare providers about all prescription, over-the-counter medicines, vitamins, and herbal supplements being used. Specific interactions to be aware of include:

  • Live Vaccines: Benlysta should not be administered concurrently with live vaccines, as its immunosuppressive action may reduce the efficacy of the vaccines.
  • Other Biologic Medicines: Caution is advised if Benlysta is used in combination with other biologic therapies, including B-cell-targeted therapies. The safety and efficacy of such combinations have not been established.
  • Cyclophosphamide and Monoclonal Antibody Medicines: Patients should inform their healthcare provider if they are using these medications.

How Benlysta Interacts with Other Lupus Treatments

Benlysta is often used in conjunction with other lupus medications. It works by targeting an underlying cause of lupus and is not a steroid. When added to standard lupus treatments, Benlysta has been shown to significantly reduce lupus disease activity, especially in the immune system, muscles, joints, mouth, and skin.


Summary of Key Clinical Trials and Their Findings

Benlysta has been studied in more clinical trials than any other lupus medicine, including the largest clinical trial in patients with lupus nephritis. These studies have consistently demonstrated Benlysta’s efficacy in reducing lupus disease activity and its safety profile. Key findings include:

  • Significant reduction in lupus disease activity in adult patients with active lupus when added to other common lupus medications.
  • Consistent safety profile across diverse patient populations.

Efficacy Data and Success Rates in Treating Lupus

In clinical trials, Benlysta, when added to standard therapy, has shown up to a 61% reduction in disease activity (SRI-4) at Week 52. It has also been proven to improve complete renal response in patients with lupus nephritis. The success rates and efficacy data indicate that Benlysta is a valuable addition to lupus treatment, particularly in managing symptoms related to the immune system, muscles, joints, mouth, and skin.

Managing Lupus with Benlysta

Comprehensive Management Strategies for Lupus When Using Benlysta

Managing lupus effectively with Benlysta involves a combination of medication adherence, regular monitoring, and lifestyle adjustments. Patients are advised to:

  • Follow Medication Regimen: Adhere strictly to the prescribed Benlysta dosage and schedule, whether it’s administered intravenously or subcutaneously.
  • Regular Monitoring: Regular check-ups with healthcare providers are crucial to monitor the effectiveness of the treatment and to adjust dosages if necessary.
  • Manage Infections: Given the immunosuppressive nature of Benlysta, patients should be vigilant about infections and seek medical attention for any signs of infection.
  • Mental Health: Patients should be aware of any changes in mood or behavior, including signs of depression or suicidal thoughts, and seek appropriate help.

Lifestyle and Dietary Considerations

While Benlysta targets the underlying causes of lupus, lifestyle and dietary choices can play a supportive role in managing the condition:

  • Balanced Diet: A healthy, balanced diet rich in fruits, vegetables, lean proteins, and whole grains can help maintain overall health.
  • Avoiding Sun Exposure: Lupus patients are often sensitive to sunlight. Wearing protective clothing and using sunscreen can help manage photosensitivity.
  • Regular Exercise: Engaging in regular, moderate exercise can help reduce fatigue, strengthen muscles, and improve overall well-being.
  • Stress Management: Techniques such as meditation, yoga, or counseling can be beneficial in managing the stress associated with living with a chronic condition like lupus.
  • Avoiding Certain Foods: Some patients may find that certain foods exacerbate their symptoms. Keeping a food diary can help identify any triggers.

Incorporating these strategies into daily life can help enhance the effectiveness of Benlysta in managing lupus and improve the quality of life for those living with this condition. It’s important for patients to work closely with their healthcare providers to tailor a management plan that suits their individual needs.

Frequently Asked Questions

Benlysta (belimumab) is a monoclonal antibody used to treat active systemic lupus erythematosus (SLE) and active lupus nephritis.

Benlysta targets and inhibits the B-lymphocyte stimulator (BLyS) protein, reducing the activity of certain B cells involved in lupus.

Benlysta is approved for adults with SLE and lupus nephritis, and for children at least 5 years old with SLE and lupus nephritis.

The safety of Benlysta in pregnant women is not fully established. Women should use contraception during treatment and for 4 months after the last dose.

It is unknown if Benlysta passes into breast milk. Consult your doctor for advice.

Benlysta is given as an infusion into a vein every 2 to 4 weeks or as a subcutaneous injection once weekly.

Common side effects include nausea, diarrhea, fever, respiratory symptoms, pain at the injection site, and headaches.

Yes, some people have had serious or fatal allergic reactions to Benlysta. Symptoms include rash, itching, swelling, and difficulty breathing.

Yes, Benlysta can increase the risk of serious or fatal infections.

Avoid being near sick people and receiving live vaccines while using Benlysta.

Benlysta may cause new or worsening depression, anxiety, or suicidal thoughts.

Use the missed dose as soon as you remember, and then return to your regular schedule. Do not double doses.

Seek emergency medical attention or call the Poison Help line.

It may take up to 8 weeks to notice improvement in symptoms, and 4 to 8 months for full effects.

Yes, Benlysta is intended for long-term use in managing lupus.

Yes, Benlysta can help reduce symptoms of fatigue, though it may take several months.

Yes, the Benlysta Cares Support Team offers a copay program that may reduce costs.

An infusion of Benlysta takes approximately 1 hour.

No, Benlysta is a biologic therapy, not a steroid.

Benlysta is approved for children 5 years of age and older with SLE and active lupus nephritis.