Drug interactions
Palbociclib + Saquinavir
Severity: Major
Palbociclib 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, a strong CYP3A inhibitor, can increase palbociclib concentrations. Higher exposure raises the risk of neutropenia and other adverse effects.
What this interaction means in plain words
Palbociclib 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
Saquinavir inhibits CYP3A4-mediated metabolism of palbociclib.
What to do
Avoid concurrent use. If unavoidable, reduce palbociclib to 75 mg daily and monitor neutrophil counts.
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 Palbociclib
Frequently asked questions
Can I take Palbociclib with Saquinavir?
MediHelp rates the interaction as major. Palbociclib 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, a strong CYP3A inhibitor, can increase palbociclib concentrations. Higher exposure raises the risk of neutropenia and other adverse effects.
How serious is the interaction between Palbociclib 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: Avoid concurrent use. If unavoidable, reduce palbociclib to 75 mg daily and monitor neutrophil counts.
What other medicines interact with Palbociclib?
MediHelp also lists interactions of Palbociclib with, for example, Apalutamide, Atazanavir, Carbamazepine. The full list is on the Palbociclib page.
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