Grapefruit and Ivacaftor interaction
Grapefruit and Ivacaftor: the Ivacaftor prescribing label 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 Ivacaftor (Kalydeco) label · effective 2026-03-23
Avoid food or drink containing grapefruit.
Therefore, avoid food or drink containing grapefruit during treatment with KALYDECO [ see Clinical Pharmacology (12.3) ].
Co-administration of KALYDECO with grapefruit juice, which contains one or more components that moderately inhibit CYP3A, may increase exposure of ivacaftor.
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.