Drug interactions
Cyclophosphamide + Dengue vaccine
Severity: Major
Cyclophosphamide and Dengue vaccine: 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
Cyclophosphamide suppresses immune function and may blunt the antibody response to the dengue vaccine, leaving the patient inadequately protected. The dengue vaccine is live attenuated, so vaccination during significant immunosuppression also carries a risk of vaccine-related infection.
What this interaction means in plain words
Cyclophosphamide and Dengue vaccine 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
Cytotoxic immunosuppression reduces vaccine immune response and impairs control of live attenuated virus replication.
What to do
Avoid giving the live dengue vaccine during cyclophosphamide therapy; vaccinate at least several weeks before starting treatment or after immune recovery, as advised by specialist guidance.
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 Cyclophosphamide
Frequently asked questions
Can I take Cyclophosphamide with Dengue vaccine?
MediHelp rates the interaction as major. Cyclophosphamide and Dengue vaccine 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. Cyclophosphamide suppresses immune function and may blunt the antibody response to the dengue vaccine, leaving the patient inadequately protected. The dengue vaccine is live attenuated, so vaccination during significant immunosuppression also carries a risk of vaccine-related infection.
How serious is the interaction between Cyclophosphamide and Dengue vaccine?
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 giving the live dengue vaccine during cyclophosphamide therapy; vaccinate at least several weeks before starting treatment or after immune recovery, as advised by specialist guidance.
What other medicines interact with Cyclophosphamide?
MediHelp also lists interactions of Cyclophosphamide with, for example, Adenovirus types 4 and 7 live, Belatacept, Bendamustine. The full list is on the Cyclophosphamide page.
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