Drug interactions
Rituximab + Smallpox vaccine live
Severity: Major
Rituximab and Smallpox vaccine live: 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
Live vaccinia vaccine can cause progressive vaccinia and other serious complications in immunocompromised patients, including those with B-cell depletion from rituximab.
What this interaction means in plain words
Rituximab and Smallpox vaccine live 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
Rituximab-induced B-cell depletion causes immunosuppression that allows live vaccinia virus to replicate in an uncontrolled way.
What to do
Avoid live smallpox vaccine during rituximab therapy and until B-cell recovery unless exposure risk clearly outweighs harm. Use a non-replicating vaccine alternative where available.
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 Rituximab with Smallpox vaccine live?
MediHelp rates the interaction as major. Rituximab and Smallpox vaccine live 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. Live vaccinia vaccine can cause progressive vaccinia and other serious complications in immunocompromised patients, including those with B-cell depletion from rituximab.
How serious is the interaction between Rituximab and Smallpox vaccine live?
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 live smallpox vaccine during rituximab therapy and until B-cell recovery unless exposure risk clearly outweighs harm. Use a non-replicating vaccine alternative where available.
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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