Drug interactions
Saquinavir + Vinorelbine
Severity: Major
Saquinavir and Vinorelbine: 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
Saquinavir, usually boosted with ritonavir, strongly inhibits CYP3A4 and can raise vinorelbine exposure. This may lead to severe neutropenia and neurotoxicity including constipation or ileus.
What this interaction means in plain words
Saquinavir and Vinorelbine 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
Inhibition of CYP3A4-mediated vinorelbine metabolism.
What to do
Avoid the combination where possible, choosing an antiretroviral with less CYP3A4 inhibition. If used together, monitor blood counts closely and consider reducing the vinorelbine dose.
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 Vinorelbine
Frequently asked questions
Can I take Saquinavir with Vinorelbine?
MediHelp rates the interaction as major. Saquinavir and Vinorelbine 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. Saquinavir, usually boosted with ritonavir, strongly inhibits CYP3A4 and can raise vinorelbine exposure. This may lead to severe neutropenia and neurotoxicity including constipation or ileus.
How serious is the interaction between Saquinavir and Vinorelbine?
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 where possible, choosing an antiretroviral with less CYP3A4 inhibition. If used together, monitor blood counts closely and consider reducing the vinorelbine dose.
What other medicines interact with Vinorelbine?
MediHelp also lists interactions of Vinorelbine with, for example, Adenovirus types 4 and 7 live, Apalutamide, Belatacept. The full list is on the Vinorelbine page.
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