Drug interactions
Carmustine + Cyclophosphamide
Severity: Major
Carmustine and Cyclophosphamide: 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 are alkylating agents with myelosuppressive effects, so combination raises the risk of severe and prolonged cytopenias. Both can also cause pulmonary toxicity, and carmustine is known for delayed lung injury, so overlapping exposure may add to that risk.
What this interaction means in plain words
Carmustine and Cyclophosphamide 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.
Carmustine belongs to Oncology; Cyclophosphamide belongs to Oncology.
Why it happens
Additive myelosuppression and overlapping pulmonary toxicity from two alkylating agents.
What to do
Monitor complete blood counts frequently, including for delayed nadirs, and adjust doses per protocol. Check pulmonary function at baseline and watch for respiratory symptoms.
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 Carmustine
- Carmustine + Pentostatin Contraindicated
- Carmustine + Chlorambucil Major
- Carmustine + Cimetidine Major
- Carmustine + Dacarbazine Major
- Carmustine + Fingolimod Major
- Carmustine + Lomustine Major
Frequently asked questions
Can I take Carmustine with Cyclophosphamide?
MediHelp rates the interaction as major. Carmustine and Cyclophosphamide 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 are alkylating agents with myelosuppressive effects, so combination raises the risk of severe and prolonged cytopenias. Both can also cause pulmonary toxicity, and carmustine is known for delayed lung injury, so overlapping exposure may add to that risk.
How serious is the interaction between Carmustine and Cyclophosphamide?
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 complete blood counts frequently, including for delayed nadirs, and adjust doses per protocol. Check pulmonary function at baseline and watch for respiratory symptoms.
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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