Dihydropyridine calcium-channel blocker
Amlodipine 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 Amlodipine (Amlodipine) at 2.5mg, 5mg, 10mg depends on whether the active ingredient Amlodipine 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 Dihydropyridine calcium-channel blocker class that go through CYP3A4 first-pass metabolism, regular grapefruit consumption can raise plasma levels of Amlodipine by a clinically meaningful margin and amplify side effects.
What to do with Amlodipine
According to the prescribing information for Amlodipine, if grapefruit is flagged as an interaction, the safest practice is to avoid grapefruit entirely or to discuss timing with the prescriber. Amlodipine selectively blocks L-type calcium channels in vascular smooth muscle, reducing transmembrane calcium influx and producing peripheral arterial vasodilation. A small occasional serving may be tolerable; daily large servings around the time of Amlodipine dosing are not recommended at 2.5mg, 5mg, 10mg.
Frequently asked questions
Can I eat grapefruit while on Amlodipine? ▾
For some Dihydropyridine calcium-channel blocker medications, grapefruit is best avoided or limited because of CYP3A4 inhibition. Whether Amlodipine specifically is affected depends on Amlodipine; the prescribing information lists this. When in doubt, ask the pharmacist or check the patient leaflet.
How much grapefruit is too much with Amlodipine? ▾
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 Amlodipine at 2.5mg, 5mg, 10mg, individual tolerance varies; the cautious choice is to avoid grapefruit if any interaction is mentioned.
Products containing Amlodipine
More on Amlodipine
- With alcoholAmlodipine and alcohol — is it safe to drink?
- With foodShould Amlodipine be taken with food?
- Side effectsAmlodipine side effects: common, rare and warning signs
- Dosage guideAmlodipine dosage guide: how much to take and when
- OnsetHow fast does Amlodipine start working?
- DurationHow long does Amlodipine last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.