Drug interactions
Cyclophosphamide + Doxorubicin
Severity: Major
Cyclophosphamide and Doxorubicin: 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
Both drugs are cardiotoxic, and combining them increases the risk of cardiac injury, particularly with high-dose cyclophosphamide and higher cumulative anthracycline doses. Additive myelosuppression also occurs, and cyclophosphamide's own urotoxicity remains a concern.
What this interaction means in plain words
Cyclophosphamide and Doxorubicin 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; Doxorubicin belongs to Oncology.
Why it happens
Additive cardiotoxic and myelosuppressive effects, with possible enhanced cyclophosphamide toxicity that is not fully characterized.
What to do
Monitor cardiac function (LVEF) and limit cumulative doxorubicin exposure, and follow blood counts. Ensure adequate hydration and mesna where indicated to protect the bladder.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Cyclophosphamide and Doxorubicin, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Cyclophosphamide
Other interactions of Doxorubicin
Frequently asked questions
Can I take Cyclophosphamide with Doxorubicin?
MediHelp rates the interaction as major. Cyclophosphamide and Doxorubicin 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. Both drugs are cardiotoxic, and combining them increases the risk of cardiac injury, particularly with high-dose cyclophosphamide and higher cumulative anthracycline doses. Additive myelosuppression also occurs, and cyclophosphamide's own urotoxicity remains a concern.
How serious is the interaction between Cyclophosphamide and Doxorubicin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor cardiac function (LVEF) and limit cumulative doxorubicin exposure, and follow blood counts. Ensure adequate hydration and mesna where indicated to protect the bladder.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
