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One whole grapefruit, or a small glass (200 mL, 6.8 US fl oz) of grapefruit juice, can cause drug overdose toxicity. [1] Fruit consumed three days before the medicine can still have an effect. [ 5 ] The relative risks of different types of citrus fruit have not been systematically studied. [ 1 ]
Still, says Peterson, "most people won't have issues unless they eat large quantities of grapefruit, drink more than one liter per day of grapefruit juice, or consistently eat or drink grapefruit.
Grapefruit interaction with medication. Several medications such as statins and calcium-channel blockers shouldn’t be taken with grapefruit or its juice because of its enzyme-binding ability ...
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]
In pharmaceutical sciences, drug interactions occur when a drug's mechanism of action is affected by the concomitant administration of substances such as foods, beverages, or other drugs. A popular example of drug–food interaction is the effect of grapefruit on the metabolism of drugs.
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Aliskiren (brand names Tekturna and Rasilez) is the first in a class of drugs called direct renin inhibitors. It is used for essential (primary) hypertension . [ 2 ] While used for high blood pressure, other better studied medications are typically recommended due to concerns of higher side effects and less evidence of benefit.
Under normal circumstances, the grapefruit juice effect is considered to be a negative interaction, and patients are often warned not to consume grapefruit or its juice when taking medication. However, some current research is focused on the potential benefits of cytochrome P450 inhibition. [ 3 ]