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Medicine, food and alcohol interactions
What to take with food and what to avoid, for common medicine groups — the grapefruit-and-statins, vitamin-K-and-warfarin, calcium-and-levothyroxine kind of question — with timing and alcohol notes. General information, not a substitute for your pharmacist.
General information only, and not exhaustive. This is not medical advice, not a full list of interactions, and not a reason to start, stop or change a medicine. Interactions depend on the exact drug, the dose, your other medicines and your own health — a pharmacist or doctor is the one who decides. Always read the leaflet that came with your medicine, and ask your pharmacist before adding anything, including supplements.
The interactions people ask about most
| Food or drink | Medicine group | Why it matters |
|---|---|---|
| Grapefruit | Statins (some) | Grapefruit blocks a gut enzyme, so more of certain statins reaches the blood than the dose intends. Which statins are affected is specific to each one. |
| Vitamin K (leafy greens) | Warfarin | Warfarin works against vitamin K, so big swings in green-vegetable intake move its effect. The advice is steadiness, not avoidance. |
| Calcium and iron | Levothyroxine | Calcium and iron bind levothyroxine in the gut and block its absorption, so they are separated from the dose by several hours. |
| Calcium, iron and dairy | Tetracycline antibiotics | The same binding problem: these antibiotics form a complex with calcium and iron that the gut cannot absorb. |
| Tyramine (aged cheese, cured meat) | MAOI antidepressants | Older MAOIs plus tyramine-rich foods can cause a dangerous rise in blood pressure — the one dietary interaction that can be an emergency. |
Every medicine group
How to use this well
The single most useful habit with any medicine is to read the leaflet once, properly, and to keep an up-to-date list of everything you take — prescription, over-the-counter and supplements — to show your pharmacist. Most interactions are managed not by avoidance but by timing and consistency: separating two things by a few hours, or keeping an intake steady rather than swinging it.
This section exists to explain the common questions in plain language, not to replace that leaflet or that conversation. Where a page here and your leaflet disagree, the leaflet wins, because it is specific to your exact medicine.
Frequently asked questions
Is this a complete list of interactions?
No, and it is not meant to be. It covers the food, drink and timing questions that come up most often for common medicine groups. The complete, authoritative list for your medicine is its own leaflet and your pharmacist.
Can I stop or change my medicine based on this?
No. Nothing here is a reason to change how you take a medicine. If something here worries you, that is a conversation to have with your pharmacist or doctor, who can see your full picture.
Why does it talk about groups instead of brand names?
Because interactions usually belong to the whole drug class, and the same drug is sold under many names. Working in groups — statins, SSRIs, ACE inhibitors — covers the mechanism without pretending every brand is identical. Your leaflet is brand-specific; this is not.
Does grapefruit really matter?
For some medicines, yes, genuinely. Grapefruit blocks an enzyme in the gut that normally breaks down certain drugs, so more of the dose reaches the blood than intended. Which medicines this affects is specific, which is exactly why the individual leaflet is the place to check.
What about supplements?
Supplements interact too — calcium and iron bind some medicines, St John's wort speeds several up, high-dose vitamins can interfere. Tell your pharmacist about everything you take, not only prescription medicines.
Blood test reference ranges · Alcohol units and clearance · Symptoms and nutrients
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