Ketoconazole and Vincristine: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Ketoconazole and Vincristine unless specifically directed by your doctor.
How Ketoconazole interacts with Vincristine
Ketoconazole strongly inhibits CYP3A4 and P-glycoprotein, reducing vincristine elimination and increasing severe neurotoxicity and ileus risk.
What you should do
Avoid concurrent systemic ketoconazole and select an antifungal with less CYP3A4 inhibition. If unavoidable, obtain specialist oncology and pharmacology input.
Key facts
Severity
Major — avoid combination
Mechanism
Ketoconazole strongly inhibits CYP3A4 and P-glycoprotein, reducing vincristine elimination and increasing severe neuroto...
Action
Avoid concurrent systemic ketoconazole and select an antifungal with less CYP3A4 inhibition. If unavoidable, obtain spec...
Frequently asked questions
Can I take Ketoconazole and Vincristine together?
No — this combination should generally be avoided. Avoid concurrent systemic ketoconazole and select an antifungal with less CYP3A4 inhibition. If unavoidable, obtain specialist oncology and pharmacology input.
What is the severity of this interaction?
The interaction between Ketoconazole and Vincristine is classified as Major — avoid combination. Ketoconazole strongly inhibits CYP3A4 and P-glycoprotein, reducing vincristine elimination and increasing severe neurotoxicity and ileus risk.
What should I do if I'm prescribed both?
Avoid concurrent systemic ketoconazole and select an antifungal with less CYP3A4 inhibition. If unavoidable, obtain specialist oncology and pharmacology input. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.