Drug interactions
Paclitaxel + Saquinavir
Severity: Major
Paclitaxel and Saquinavir: 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, may raise paclitaxel concentrations. This increases the risk of myelosuppression and neuropathy.
What this interaction means in plain words
Paclitaxel and Saquinavir 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 (and P-glycoprotein) reduces paclitaxel clearance.
What to do
Prefer an antiretroviral regimen without CYP3A4 inhibition. If the combination is used, monitor blood counts and neuropathy and reduce the paclitaxel dose as needed.
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 Paclitaxel
Frequently asked questions
Can I take Paclitaxel with Saquinavir?
MediHelp rates the interaction as major. Paclitaxel and Saquinavir 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, may raise paclitaxel concentrations. This increases the risk of myelosuppression and neuropathy.
How serious is the interaction between Paclitaxel and Saquinavir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer an antiretroviral regimen without CYP3A4 inhibition. If the combination is used, monitor blood counts and neuropathy and reduce the paclitaxel dose as needed.
What other medicines interact with Paclitaxel?
MediHelp also lists interactions of Paclitaxel with, for example, Adenovirus types 4 and 7 live, Cobicistat, Cyclosporine. The full list is on the Paclitaxel page.
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