Drug interactions
Ofatumumab sc + Rituximab
Severity: Major
Ofatumumab sc and Rituximab: major 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 are anti-CD20 antibodies that deplete B cells, so combining them produces additive immunosuppression and a higher risk of infections. There is no rationale for concurrent use, and prolonged B-cell depletion persists after rituximab.
What this interaction means in plain words
Ofatumumab sc and Rituximab can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Duplicate anti-CD20 B-cell depletion causing additive immunosuppression.
What to do
Avoid concurrent use. When switching, consider the duration of rituximab effect and check B-cell counts and immunoglobulins before starting ofatumumab, and monitor for infection.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Rituximab
Frequently asked questions
Can I take Ofatumumab sc with Rituximab?
MediHelp rates the interaction as major. Ofatumumab sc and Rituximab can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both are anti-CD20 antibodies that deplete B cells, so combining them produces additive immunosuppression and a higher risk of infections. There is no rationale for concurrent use, and prolonged B-cell depletion persists after rituximab.
How serious is the interaction between Ofatumumab sc and Rituximab?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use. When switching, consider the duration of rituximab effect and check B-cell counts and immunoglobulins before starting ofatumumab, and monitor for infection.
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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