Triazole antifungal
Fluconazole and grapefruit: a real interaction?
Grapefruit is famous as the juice that interacts with medications, and the warning is real for a number of drugs. Whether it matters specifically for Fluconazole (Fluconazole) at 50mg, 100mg, 150mg, 200mg depends on whether the active ingredient Fluconazole is metabolised by CYP3A4 in the gut wall and how much that pathway contributes to first-pass metabolism.
The CYP3A4 mechanism
Grapefruit (and its juice) inhibits CYP3A4 enzymes in the gut wall, increasing the absorbed dose of medications metabolised by that enzyme. For drugs in the Triazole antifungal class that go through CYP3A4 first-pass metabolism, regular grapefruit consumption can raise plasma levels of Fluconazole by a clinically meaningful margin and amplify side effects.
What to do with Fluconazole
According to the prescribing information for Fluconazole, if grapefruit is flagged as an interaction, the safest practice is to avoid grapefruit entirely or to discuss timing with the prescriber. Fluconazole is a triazole antifungal that inhibits the cytochrome P450-dependent enzyme lanosterol 14-alpha-demethylase, blocking the synthesis of ergosterol from lanosterol. A small occasional serving may be tolerable; daily large servings around the time of Fluconazole dosing are not recommended at 50mg, 100mg, 150mg, 200mg.
Frequently asked questions
Can I eat grapefruit while on Fluconazole? ▾
For some Triazole antifungal medications, grapefruit is best avoided or limited because of CYP3A4 inhibition. Whether Fluconazole specifically is affected depends on Fluconazole; the prescribing information lists this. When in doubt, ask the pharmacist or check the patient leaflet.
How much grapefruit is too much with Fluconazole? ▾
For drugs where the interaction matters, even modest daily grapefruit intake (one whole grapefruit or one large glass of juice) can shift drug levels noticeably. For Fluconazole at 50mg, 100mg, 150mg, 200mg, individual tolerance varies; the cautious choice is to avoid grapefruit if any interaction is mentioned.
Products containing Fluconazole
More on Fluconazole
- With alcoholFluconazole and alcohol — is it safe to drink?
- With foodShould Fluconazole be taken with food?
- Side effectsFluconazole side effects: common, rare and warning signs
- Dosage guideFluconazole dosage guide: how much to take and when
- OnsetHow fast does Fluconazole start working?
- DurationHow long does Fluconazole last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.