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Researchers have identified over 85 drugs with which grapefruit reacts adversely. [ 45 ] [ 1 ] According to a review done by the Canadian Medical Association , [ 1 ] there is an increase in the number of potential drugs that can interact with grapefruit juice, and of the number of fruit types that can interact with those drugs.
For example, when the blood pressure drug felodipine is taken with grapefruit juice rather than water, levels of the medication in the blood can more than double and result in headache, irregular ...
When two drugs affect each other, it is a drug–drug interaction (DDI). The risk of a DDI increases with the number of drugs used. [1] A large share of elderly people regularly use five or more medications or supplements, with a significant risk of side-effects from drug–drug interactions. [2] Drug interactions can be of three kinds:
Beyond adverse effects from the herb itself, "adulteration, inappropriate formulation, or lack of understanding of plant and drug interactions have led to adverse reactions that are sometimes life threatening or lethal." [3]
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Grapefruit contains vitamin C, a powerful antioxidant that can boost the immune system. ... plus important precautions about grapefruit’s interaction with medications. Grapefruit, similar to ...
Grapefruit and grapefruit juice have been found to interact with numerous drugs, in many cases resulting in adverse effects. [4] This happens in two ways: one is that grapefruit can block an enzyme which metabolizes medication, [5] and if the drug is not metabolized, then the level of the drug in the blood can become too high, leading to an adverse effect. [5]
The Grapefruit-drug interaction article lists Levothyroxine as one of the drugs whose absorption is affected by grapefruit, but the only readily available research online, which is the one cited, ([1]), concluded that "Grapefruit juice may slightly delay the absorption of levothyroxine, but it seems to have only a minor effect on its ...