Food–Drug Interactions: Grapefruit, Calcium and Iron Overview Certain foods and supplements can change how medicines are absorbed or broken down. Grapefruit affects the metabolism of some drugs; calcium or iron may interfere with absorption of particular medicines. How is it…
Food–Drug Interactions: Grapefruit, Calcium and Iron
Overview
Certain foods and supplements can change how medicines are absorbed or broken down. Grapefruit affects the metabolism of some drugs; calcium or iron may interfere with absorption of particular medicines.
How is it assessed?
Rules vary by medication. The exact drug, timing, dose and kidney or liver function determine whether an interaction matters.
Practical next steps
Show a pharmacist your complete list of prescriptions, supplements and herbal products. Check the patient leaflet and seek advice before changing dosing times.
When is urgent help needed?
Lip or tongue swelling, breathlessness or a severe new rash after a medicine may require emergency help.
Frequently asked questions
Is this information enough for a diagnosis?
No. Symptoms, examination, personal history and additional tests when needed must be considered together.
This article provides general health information and is not a substitute for individual assessment, diagnosis or treatment by a qualified professional.
