Health, Explained · 55 sec
Grapefruit Can Change How Some Medicines Work
A food can raise or lower the amount of a medicine that reaches your blood.
The useful idea
- Not every medicine
Grapefruit affects some prescription and over-the-counter medicines, but it does not interact with every drug.
- Levels can rise
By blocking the intestinal enzyme CYP3A4, grapefruit can let more of certain medicines enter the blood and remain longer.
- Levels can also fall
For a few medicines, grapefruit affects transporters instead and can reduce absorption, making the medicine work less well.
Why this matters
The direction and strength of the interaction depend on the specific medicine, the person, and the amount consumed.
Try this
Check the label and ask a pharmacist whether grapefruit, pomelo, or Seville orange interacts with your medicine.
Test your recall
Which action best applies “Grapefruit Can Change How Some Medicines Work”?
- Ask what kind of study it was, who was studied, and whether other studies found the same pattern.
- Maintain carbon-monoxide alarms; move to fresh air and seek emergency help if exposure is suspected.
- Check the label and ask a pharmacist whether grapefruit, pomelo, or Seville orange interacts with your medicine. — correct
The direction and strength of the interaction depend on the specific medicine, the person, and the amount consumed.
General education only — not medical advice, diagnosis, or treatment.