Drug interactions
Saquinavir + Vincristine
Severity: Major
Saquinavir and Vincristine: 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
Ritonavir-boosted saquinavir inhibits CYP3A4 and may substantially raise vincristine levels. This can cause severe neurotoxicity including neuropathy and paralytic ileus.
What this interaction means in plain words
Saquinavir and Vincristine 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.
Why it happens
Saquinavir (with ritonavir) inhibits CYP3A4 and decreases vincristine clearance.
What to do
Avoid the combination and use an antiretroviral regimen without CYP3A4 inhibition during vincristine therapy if feasible. If unavoidable, monitor closely for neurotoxicity.
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 Vincristine
- Adenovirus types 4 and 7 live + Vincristine Contraindicated
- Apalutamide + Vincristine Major
- Atazanavir + Vincristine Major
- Ceritinib + Vincristine Major
- Chloramphenicol + Vincristine Major
- Clarithromycin + Vincristine Major
Frequently asked questions
Can I take Saquinavir with Vincristine?
MediHelp rates the interaction as major. Saquinavir and Vincristine 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. Ritonavir-boosted saquinavir inhibits CYP3A4 and may substantially raise vincristine levels. This can cause severe neurotoxicity including neuropathy and paralytic ileus.
How serious is the interaction between Saquinavir and Vincristine?
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 the combination and use an antiretroviral regimen without CYP3A4 inhibition during vincristine therapy if feasible. If unavoidable, monitor closely for neurotoxicity.
What other medicines interact with Vincristine?
MediHelp also lists interactions of Vincristine with, for example, Adenovirus types 4 and 7 live, Apalutamide, Atazanavir. The full list is on the Vincristine page.
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