Drug interactions
Diphtheria and tetanus toxoids + Melphalan
Severity: Moderate
Diphtheria and tetanus toxoids and Melphalan: 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-induced immunosuppression can blunt the antibody response to diphtheria and tetanus toxoids. Protection may be inadequate.
What this interaction means in plain words
Diphtheria and tetanus toxoids and Melphalan 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 impairs the immune response to vaccine antigens.
What to do
Vaccinate at least 2 weeks before starting melphalan when possible. If given during therapy, revaccinate at least 3 months after treatment ends.
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 Diphtheria and tetanus toxoids with Melphalan?
MediHelp rates the interaction as moderate. Diphtheria and tetanus toxoids and Melphalan 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-induced immunosuppression can blunt the antibody response to diphtheria and tetanus toxoids. Protection may be inadequate.
How serious is the interaction between Diphtheria and tetanus toxoids and Melphalan?
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 at least 2 weeks before starting melphalan when possible. If given during therapy, revaccinate at least 3 months after treatment ends.
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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