Progestin
Medroxyprogesterone 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 Medroxyprogesterone (Medroxyprogesterone) at 2.5mg, 5mg, 10mg depends on whether the active ingredient Medroxyprogesterone 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 Progestin class that go through CYP3A4 first-pass metabolism, regular grapefruit consumption can raise plasma levels of Medroxyprogesterone by a clinically meaningful margin and amplify side effects.
What to do with Medroxyprogesterone
According to the prescribing information for Medroxyprogesterone, if grapefruit is flagged as an interaction, the safest practice is to avoid grapefruit entirely or to discuss timing with the prescriber. MPA binds progesterone receptors and produces strong progestational effects: thickening cervical mucus, inhibiting ovulation, thinning the endometrium and reducing hot flashes. A small occasional serving may be tolerable; daily large servings around the time of Medroxyprogesterone dosing are not recommended at 2.5mg, 5mg, 10mg.
Frequently asked questions
Can I eat grapefruit while on Medroxyprogesterone? ▾
For some Progestin medications, grapefruit is best avoided or limited because of CYP3A4 inhibition. Whether Medroxyprogesterone specifically is affected depends on Medroxyprogesterone; the prescribing information lists this. When in doubt, ask the pharmacist or check the patient leaflet.
How much grapefruit is too much with Medroxyprogesterone? ▾
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 Medroxyprogesterone at 2.5mg, 5mg, 10mg, individual tolerance varies; the cautious choice is to avoid grapefruit if any interaction is mentioned.
Products containing Medroxyprogesterone
More on Medroxyprogesterone
- With alcoholMedroxyprogesterone and alcohol — is it safe to drink?
- With foodShould Medroxyprogesterone be taken with food?
- Side effectsMedroxyprogesterone side effects: common, rare and warning signs
- Dosage guideMedroxyprogesterone dosage guide: how much to take and when
- OnsetHow fast does Medroxyprogesterone start working?
- DurationHow long does Medroxyprogesterone last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.