Macrolide antibiotic
Azithromycin 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 Azithromycin (Azithromycin) at 250mg, 500mg, 600mg depends on whether the active ingredient Azithromycin 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 Macrolide antibiotic class that go through CYP3A4 first-pass metabolism, regular grapefruit consumption can raise plasma levels of Azithromycin by a clinically meaningful margin and amplify side effects.
What to do with Azithromycin
According to the prescribing information for Azithromycin, if grapefruit is flagged as an interaction, the safest practice is to avoid grapefruit entirely or to discuss timing with the prescriber. Azithromycin reversibly binds the 50S ribosomal subunit of susceptible bacteria, inhibiting protein synthesis. A small occasional serving may be tolerable; daily large servings around the time of Azithromycin dosing are not recommended at 250mg, 500mg, 600mg.
Frequently asked questions
Can I eat grapefruit while on Azithromycin? ▾
For some Macrolide antibiotic medications, grapefruit is best avoided or limited because of CYP3A4 inhibition. Whether Azithromycin specifically is affected depends on Azithromycin; the prescribing information lists this. When in doubt, ask the pharmacist or check the patient leaflet.
How much grapefruit is too much with Azithromycin? ▾
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 Azithromycin at 250mg, 500mg, 600mg, individual tolerance varies; the cautious choice is to avoid grapefruit if any interaction is mentioned.
Products containing Azithromycin
More on Azithromycin
- With alcoholAzithromycin and alcohol — is it safe to drink?
- With foodShould Azithromycin be taken with food?
- Side effectsAzithromycin side effects: common, rare and warning signs
- Dosage guideAzithromycin dosage guide: how much to take and when
- OnsetHow fast does Azithromycin start working?
- DurationHow long does Azithromycin last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.