Drug interactions
Belimumab + Rituximab
Severity: Moderate
Belimumab and Rituximab: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs target B-cell biology, and used together they may increase infection risk. Belimumab can also be given after rituximab in lupus, but the overlap raises the burden of immunosuppression.
What this interaction means in plain words
Belimumab and Rituximab can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Belimumab belongs to Miscellaneous; Rituximab belongs to Musculoskeletal.
Why it happens
Additive B-cell directed immunosuppression: CD20 depletion plus BLyS inhibition.
What to do
Monitor for infection and immunoglobulin levels. Use the combination only when the benefit is clear.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Rituximab
Other interactions of Belimumab
- Belimumab + Measles mumps and rubella vaccine Major
- Abatacept + Belimumab Moderate
- Adalimumab + Belimumab Moderate
- Anakinra + Belimumab Moderate
- Anti-thymocyte + Belimumab Moderate
- Belimumab + Denosumab Moderate
Frequently asked questions
Can I take Belimumab with Rituximab?
MediHelp rates the interaction as moderate. Belimumab and Rituximab can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both drugs target B-cell biology, and used together they may increase infection risk. Belimumab can also be given after rituximab in lupus, but the overlap raises the burden of immunosuppression.
How serious is the interaction between Belimumab and Rituximab?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for infection and immunoglobulin levels. Use the combination only when the benefit is clear.
What other medicines interact with Rituximab?
MediHelp also lists interactions of Rituximab with, for example, Adenovirus types 4 and 7 live, Baricitinib, Certolizumab pegol. The full list is on the Rituximab page.
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