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Grapefruit and its juice (fresh or frozen) can either increase or, less frequently, decrease the effects of some drugs. Grapefruit contains substances that can interfere with the transformation and elimination mechanisms of certain drugs when they are administered orally, resulting in serious adverse reactions.
As little as 200 mL of juice or a whole grapefruit can cause a significant increase of blood levels of certain drugs. The effects of grapefruit can last up to 3 days, sometimes even longer. Because the effects of grapefruit last a long time, they cannot be avoided by spacing medication and grapefruit apart. Drinking grapefruit juice in the morning, for example, and then taking your medication at night will not eliminate the risk of interaction.
Grapefruit interactions are highly unpredictable. Not everyone will react the same way; it depends on which drug is involved, the grapefruit itself, and how sensitive you are to these effects.
To minimize the risk of drug interaction, refrain from eating grapefruits or drinking grapefruit juice if you are taking one of the following drugs. Seville oranges (used in marmalade), limes and pomelos may produce similar effects to grapefruit. Most citrus fruit, including lemons, sweet oranges (Navel or Valencia) and tangerines are considered safe. Patients treated with certain medications may have to avoid other fruits and their juices (e.g., starfruit, pomegranate). Speak to your pharmacist.
|Drugs that interact with grapefruit juice|
Never take your medications with grapefruit before checking with your pharmacist or physician.
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The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.