Quinidine and Vepdegestrant interaction
Quinidine and Vepdegestrant: the Vepdegestrant prescribing label flags 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 Vepdegestrant (VEPPANU) label · effective 2026-06-12
Avoid concomitant use of VEPPANU with strong CYP3A inhibitors or drugs known to prolong the QTc interval.
Drugs that Prolong QTc Interval Avoid concomitant use of VEPPANU with other drugs with a known potential to prolong the QTc interval.
In patients with congenital long QTc syndrome, congestive heart failure, electrolyte abnormalities, or those who are taking medications known to prolong the QTc interval, additional ECG monitoring may be necessary.
Concomitant use of VEPPANU with other drugs that prolong the QTc interval may result in a greater increase in the QTc interval and adverse reactions associated with QTc interval prolongation, including Torsade de Pointes, other serious arrhythmias, and sudden death [see Warnings and Precautions ( 5.1 )] .
Mechanism and Clinical Effect(s) Vepdegestrant is a P-gp inhibitor.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
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.