Potassium-sparing diuretic
Amiloride 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 Amiloride (Amiloride) at 5mg depends on whether the active ingredient Amiloride 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 Potassium-sparing diuretic class that go through CYP3A4 first-pass metabolism, regular grapefruit consumption can raise plasma levels of Amiloride by a clinically meaningful margin and amplify side effects.
What to do with Amiloride
According to the prescribing information for Amiloride, if grapefruit is flagged as an interaction, the safest practice is to avoid grapefruit entirely or to discuss timing with the prescriber. Amiloride blocks the epithelial sodium channel (ENaC) in the distal convoluted tubule and collecting duct of the kidney, reducing sodium reabsorption and indirectly decreasing potassium and hydrogen i… A small occasional serving may be tolerable; daily large servings around the time of Amiloride dosing are not recommended at 5mg.
Frequently asked questions
Can I eat grapefruit while on Amiloride? ▾
For some Potassium-sparing diuretic medications, grapefruit is best avoided or limited because of CYP3A4 inhibition. Whether Amiloride specifically is affected depends on Amiloride; the prescribing information lists this. When in doubt, ask the pharmacist or check the patient leaflet.
How much grapefruit is too much with Amiloride? ▾
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 Amiloride at 5mg, individual tolerance varies; the cautious choice is to avoid grapefruit if any interaction is mentioned.
Products containing Amiloride
More on Amiloride
- With alcoholAmiloride and alcohol — is it safe to drink?
- With foodShould Amiloride be taken with food?
- Side effectsAmiloride side effects: common, rare and warning signs
- Dosage guideAmiloride dosage guide: how much to take and when
- OnsetHow fast does Amiloride start working?
- DurationHow long does Amiloride last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.