Drug interactions
Influenza a vaccine + Thioguanine
Severity: Moderate
Influenza a vaccine and Thioguanine: 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 not live, so it is safe to give, but immunosuppression from thioguanine may reduce the antibody response. Protection may be weaker than in healthy people.
What this interaction means in plain words
Influenza a vaccine and Thioguanine 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
Cytotoxic antimetabolite-induced suppression of lymphocytes reduces vaccine immunogenicity.
What to do
Vaccinate before therapy or at a time of better immune function where possible; do not rely on the response and consider checking antibody levels.
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 Thioguanine
Frequently asked questions
Can I take Influenza a vaccine with Thioguanine?
MediHelp rates the interaction as moderate. Influenza a vaccine and Thioguanine 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 not live, so it is safe to give, but immunosuppression from thioguanine may reduce the antibody response. Protection may be weaker than in healthy people.
How serious is the interaction between Influenza a vaccine and Thioguanine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Vaccinate before therapy or at a time of better immune function where possible; do not rely on the response and consider checking antibody levels.
What other medicines interact with Thioguanine?
MediHelp also lists interactions of Thioguanine with, for example, Adenovirus types 4 and 7 live, Axicabtagene ciloleucel, Belatacept. The full list is on the Thioguanine page.
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