PDE5 inhibitor
Sildenafil Citrate 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 Sildenafil Citrate (Sildenafil Citrate) at 100mg, 50mg, 25mg depends on whether the active ingredient Sildenafil Citrate 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 PDE5 inhibitor class that go through CYP3A4 first-pass metabolism, regular grapefruit consumption can raise plasma levels of Sildenafil Citrate by a clinically meaningful margin and amplify side effects.
What to do with Sildenafil Citrate
According to the prescribing information for Sildenafil Citrate, if grapefruit is flagged as an interaction, the safest practice is to avoid grapefruit entirely or to discuss timing with the prescriber. Sildenafil citrate selectively inhibits phosphodiesterase type 5 (PDE5), an enzyme that breaks down cyclic guanosine monophosphate in the corpus cavernosum. A small occasional serving may be tolerable; daily large servings around the time of Sildenafil Citrate dosing are not recommended at 100mg, 50mg, 25mg.
Frequently asked questions
Can I eat grapefruit while on Sildenafil Citrate? ▾
For some PDE5 inhibitor medications, grapefruit is best avoided or limited because of CYP3A4 inhibition. Whether Sildenafil Citrate specifically is affected depends on Sildenafil Citrate; the prescribing information lists this. When in doubt, ask the pharmacist or check the patient leaflet.
How much grapefruit is too much with Sildenafil Citrate? ▾
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 Sildenafil Citrate at 100mg, 50mg, 25mg, individual tolerance varies; the cautious choice is to avoid grapefruit if any interaction is mentioned.
Products containing Sildenafil Citrate
More on Sildenafil Citrate
- With alcoholSildenafil Citrate and alcohol — is it safe to drink?
- With foodShould Sildenafil Citrate be taken with food?
- Side effectsSildenafil Citrate side effects: common, rare and warning signs
- Dosage guideSildenafil Citrate dosage guide: how much to take and when
- OnsetHow fast does Sildenafil Citrate start working?
- DurationHow long does Sildenafil Citrate last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.