Drug interactions
Mechlorethamine + Rituximab
Severity: Moderate
Mechlorethamine and Rituximab: 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
Both agents suppress the immune system, and mechlorethamine is also strongly myelotoxic. Together they can deepen cytopenias and increase the risk of serious infection.
What this interaction means in plain words
Mechlorethamine and Rituximab 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.
Mechlorethamine belongs to Oncology; Rituximab belongs to Musculoskeletal.
Why it happens
Additive immunosuppression from B-cell depletion plus alkylating-agent bone marrow suppression.
What to do
Monitor complete blood counts regularly and watch for infection and febrile neutropenia. Consider growth factor support or anti-infective prophylaxis according to regimen risk.
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 Rituximab
Other interactions of Mechlorethamine
Frequently asked questions
Can I take Mechlorethamine with Rituximab?
MediHelp rates the interaction as moderate. Mechlorethamine and Rituximab 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. Both agents suppress the immune system, and mechlorethamine is also strongly myelotoxic. Together they can deepen cytopenias and increase the risk of serious infection.
How serious is the interaction between Mechlorethamine and Rituximab?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor complete blood counts regularly and watch for infection and febrile neutropenia. Consider growth factor support or anti-infective prophylaxis according to regimen risk.
What other medicines interact with Rituximab?
MediHelp also lists interactions of Rituximab with, for example, Adenovirus types 4 and 7 live, Baricitinib, Certolizumab pegol. The full list is on the Rituximab page.
Full monographs, dosing and an interaction checker in the MediHelp app
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