Drug interactions
Cyclophosphamide + Etrasimod
Severity: Major
Cyclophosphamide and Etrasimod: 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
Etrasimod lowers circulating lymphocytes, and cyclophosphamide is myelosuppressive and immunosuppressive. Together they may produce additive immune suppression and increase the risk of serious infection, and this combination has not been studied.
What this interaction means in plain words
Cyclophosphamide and Etrasimod 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 belongs to Oncology; Etrasimod belongs to Gastrointestinal Tract.
Why it happens
Additive immunosuppression through lymphocyte sequestration (S1P receptor modulation) plus cytotoxic marrow and lymphocyte suppression.
What to do
Avoid concurrent use where possible, and consider the persisting etrasimod effect for several weeks after stopping. If it is used, monitor blood counts and watch for infection.
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
Other interactions of Etrasimod
- Abatacept + Etrasimod Major
- Amiodarone + Etrasimod Major
- Anagrelide + Etrasimod Major
- Anakinra + Etrasimod Major
- Anti-thymocyte + Etrasimod Major
- Asenapine + Etrasimod Major
Frequently asked questions
Can I take Cyclophosphamide with Etrasimod?
MediHelp rates the interaction as major. Cyclophosphamide and Etrasimod 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. Etrasimod lowers circulating lymphocytes, and cyclophosphamide is myelosuppressive and immunosuppressive. Together they may produce additive immune suppression and increase the risk of serious infection, and this combination has not been studied.
How serious is the interaction between Cyclophosphamide and Etrasimod?
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 concurrent use where possible, and consider the persisting etrasimod effect for several weeks after stopping. If it is used, monitor blood counts and watch for infection.
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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