Drug interactions
Melphalan + Rabies vaccine
Severity: Moderate
Melphalan and Rabies 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
Melphalan-related immunosuppression may lower the neutralizing antibody response to rabies vaccine. This is important because rabies is almost always fatal once symptomatic.
What this interaction means in plain words
Melphalan and Rabies 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
Cytotoxic immunosuppression by melphalan reduces B- and T-cell responses to vaccine antigens.
What to do
If post-exposure prophylaxis is needed, give it without delay and check rabies neutralizing antibody titers afterward. For pre-exposure vaccination, complete it before melphalan when feasible.
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 Melphalan
- Adenovirus types 4 and 7 live + Melphalan Contraindicated
- Bcg vaccine live + Melphalan Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Melphalan Contraindicated
- Measles mumps and rubella vaccine live + Melphalan Contraindicated
- Measles mumps and rubella vaccine + Melphalan Contraindicated
- Measles mumps rubella and varicella vaccine live + Melphalan Contraindicated
Frequently asked questions
Can I take Melphalan with Rabies vaccine?
MediHelp rates the interaction as moderate. Melphalan and Rabies 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. Melphalan-related immunosuppression may lower the neutralizing antibody response to rabies vaccine. This is important because rabies is almost always fatal once symptomatic.
How serious is the interaction between Melphalan and Rabies 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: If post-exposure prophylaxis is needed, give it without delay and check rabies neutralizing antibody titers afterward. For pre-exposure vaccination, complete it before melphalan when feasible.
What other medicines interact with Melphalan?
MediHelp also lists interactions of Melphalan with, for example, Adenovirus types 4 and 7 live, Bcg vaccine live, Influenza virus vaccine quadrivalent intranasal. The full list is on the Melphalan page.
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