Paclitaxel and Ritonavir: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Paclitaxel and Ritonavir unless specifically directed by your doctor.
How Paclitaxel interacts with Ritonavir
Ritonavir strongly inhibits CYP3A4 and P-glycoprotein, potentially increasing paclitaxel exposure and severe haematological or neurological toxicity.
What you should do
Avoid the combination when possible and involve oncology and HIV specialists in selecting alternatives. If unavoidable, use intensive toxicity and blood-count monitoring with protocol-directed dose adjustment.
Key facts
Severity
Major — avoid combination
Mechanism
Ritonavir strongly inhibits CYP3A4 and P-glycoprotein, potentially increasing paclitaxel exposure and severe haematologi...
Action
Avoid the combination when possible and involve oncology and HIV specialists in selecting alternatives. If unavoidable, ...
Frequently asked questions
Can I take Paclitaxel and Ritonavir together?
No — this combination should generally be avoided. Avoid the combination when possible and involve oncology and HIV specialists in selecting alternatives. If unavoidable, use intensive toxicity and blood-count monitoring with protocol-directed dose adjustment.
What is the severity of this interaction?
The interaction between Paclitaxel and Ritonavir is classified as Major — avoid combination. Ritonavir strongly inhibits CYP3A4 and P-glycoprotein, potentially increasing paclitaxel exposure and severe haematological or neurological toxicity.
What should I do if I'm prescribed both?
Avoid the combination when possible and involve oncology and HIV specialists in selecting alternatives. If unavoidable, use intensive toxicity and blood-count monitoring with protocol-directed dose adjustment. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.