Beta-lactamase inhibitor
Clavulanate 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 Clavulanate (Clavulanate) at 500/125mg, 875/125mg, 1000/62.5mg depends on whether the active ingredient Clavulanate 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 Beta-lactamase inhibitor class that go through CYP3A4 first-pass metabolism, regular grapefruit consumption can raise plasma levels of Clavulanate by a clinically meaningful margin and amplify side effects.
What to do with Clavulanate
According to the prescribing information for Clavulanate, if grapefruit is flagged as an interaction, the safest practice is to avoid grapefruit entirely or to discuss timing with the prescriber. Clavulanate binds irreversibly to the active site of many class A beta-lactamases produced by bacteria, acting as a 'suicide inhibitor'. A small occasional serving may be tolerable; daily large servings around the time of Clavulanate dosing are not recommended at 500/125mg, 875/125mg, 1000/62.5mg.
Frequently asked questions
Can I eat grapefruit while on Clavulanate? ▾
For some Beta-lactamase inhibitor medications, grapefruit is best avoided or limited because of CYP3A4 inhibition. Whether Clavulanate specifically is affected depends on Clavulanate; the prescribing information lists this. When in doubt, ask the pharmacist or check the patient leaflet.
How much grapefruit is too much with Clavulanate? ▾
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 Clavulanate at 500/125mg, 875/125mg, 1000/62.5mg, individual tolerance varies; the cautious choice is to avoid grapefruit if any interaction is mentioned.
Products containing Clavulanate
More on Clavulanate
- With alcoholClavulanate and alcohol — is it safe to drink?
- With foodShould Clavulanate be taken with food?
- Side effectsClavulanate side effects: common, rare and warning signs
- Dosage guideClavulanate dosage guide: how much to take and when
- OnsetHow fast does Clavulanate start working?
- DurationHow long does Clavulanate last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.