Drug interactions
Cyclophosphamide + Saquinavir
Severity: Moderate
Cyclophosphamide and Saquinavir: 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
Saquinavir, a CYP3A4 inhibitor, may change the metabolism of cyclophosphamide. This could alter exposure to active or toxic metabolites, with unpredictable effects on efficacy and myelosuppression.
What this interaction means in plain words
Cyclophosphamide and Saquinavir 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
CYP3A4 inhibition by saquinavir may alter hepatic activation and clearance of cyclophosphamide.
What to do
Monitor complete blood counts and clinical response during co-therapy. Consider an alternative antiretroviral if toxicity occurs.
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 Cyclophosphamide
Frequently asked questions
Can I take Cyclophosphamide with Saquinavir?
MediHelp rates the interaction as moderate. Cyclophosphamide and Saquinavir 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. Saquinavir, a CYP3A4 inhibitor, may change the metabolism of cyclophosphamide. This could alter exposure to active or toxic metabolites, with unpredictable effects on efficacy and myelosuppression.
How serious is the interaction between Cyclophosphamide and Saquinavir?
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 and clinical response during co-therapy. Consider an alternative antiretroviral if toxicity occurs.
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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