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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 ]
A mycotoxin is suspected to be involved, but none has been found in grapes or raisins ingested by affected dogs. [5] The dose-response relationship has not been determined, [2] but one study estimated 3 g/kg or greater for grapes or raisins. [6] An April 2021 letter to the editor of JAVMA hypothesized that the tartaric acid in grapes could be ...
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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.
Aliskiren is a minor inhibitor of substrate CYP3A4 and, more importantly, P-glycoprotein: It reduces furosemide blood concentration. Atorvastatin may increase aliskiren's blood concentration, but no dose adjustment is needed. Due to possible interaction with ciclosporin, the use of ciclosporin and aliskiren at the same time is contraindicated.
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 is famously juicy and tangy, with its yellow, pink or ruby flesh reaching peak ripeness in the winter months. The citrus gets a lot of buzz during cold and flu season and weight-loss ...
Grapefruit–drug interactions are common, as the juice contains furanocoumarins that interfere with the metabolism of many drugs. This can prolong and intensify the effects of those drugs, leading to multiple side-effects such as abnormal heart rhythms, bleeding inside the stomach, low blood pressure, difficulty breathing, and dizziness.