Posaconazole and Vincristine interaction
Posaconazole and Vincristine: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Vincristine (VinCRIStine Sulfate) label · effective 2026-02-17
Therefore, the concomitant use of strong CYP3A inhibitors with vincristine sulfate should be avoided.
Therefore, the concomitant use of P-gp inhibitors or inducers should be avoided.
Patients should be frequently monitored for adverse reactions with concomitant use of moderate CYP3A inhibitors (e.g., fluconazole) with vincristine sulfate.
From the Posaconazole (NOXAFIL) label · effective 2026-02-13
Vincristine Toxicity : Concomitant administration of azole antifungals, including Noxafil, with vincristine has been associated with neurotoxicity and other serious adverse reactions; reserve azole antifungals, including Noxafil, for patients receiving a vinca alkaloid, including vincristine, who have no alternative antifungal treatment options.
Vincristine Toxicity Concomitant administration of azole antifungals, including Noxafil, with vincristine has been associated with neurotoxicity and other serious adverse reactions, including seizures, peripheral neuropathy, syndrome of inappropriate antidiuretic hormone secretion, and paralytic ileus.
Vinca alkaloids (e.g., vincristine, vinblastine) Reserve concomitant use for patients with no alternative antifungal treatment options [see Warnings and Precautions (5.8) ].
Reserve azole antifungals, including Noxafil, for patients receiving a vinca alkaloid, including vincristine, who have no alternative antifungal treatment options [see Drug Interactions (7.2) ] .
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.