Drug interactions
Fludarabine + Influenza a vaccine
Severity: Moderate
Fludarabine and Influenza a vaccine: 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
The H5N1 influenza vaccine is an inactivated vaccine and is not a risk of infection, but fludarabine causes marked lymphopenia and impaired antibody production. The vaccine response may therefore be weaker or absent.
What this interaction means in plain words
Fludarabine and Influenza a vaccine 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.
Why it happens
Fludarabine-induced suppression of B- and T-lymphocyte function reduces the immune response to vaccination.
What to do
Where possible, vaccinate at least 2 weeks before starting fludarabine or defer until immune recovery; if given during therapy, do not count on protection and consider checking antibody response.
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 Fludarabine
- Adenovirus types 4 and 7 live + Fludarabine Contraindicated
- Fludarabine + Pentostatin Contraindicated
- Belatacept + Fludarabine Major
- Dengue vaccine + Fludarabine Major
- Etrasimod + Fludarabine Major
- Fingolimod + Fludarabine Major
Frequently asked questions
Can I take Fludarabine with Influenza a vaccine?
MediHelp rates the interaction as moderate. Fludarabine and Influenza a vaccine 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. The H5N1 influenza vaccine is an inactivated vaccine and is not a risk of infection, but fludarabine causes marked lymphopenia and impaired antibody production. The vaccine response may therefore be weaker or absent.
How serious is the interaction between Fludarabine and Influenza a vaccine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Where possible, vaccinate at least 2 weeks before starting fludarabine or defer until immune recovery; if given during therapy, do not count on protection and consider checking antibody response.
What other medicines interact with Fludarabine?
MediHelp also lists interactions of Fludarabine with, for example, Adenovirus types 4 and 7 live, Pentostatin, Belatacept. The full list is on the Fludarabine page.
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