Grapefruit juice significantly inhibits the metabolism of amiodarone, leading to increased blood levels and heightened risk of toxicity.
Complete avoidance of grapefruit juice is recommended due to potent and prolonged CYP3A4 inhibition.
Even small amounts (e.g., 8 oz) can cause significant interaction effects lasting up to 72 hours.
Patients should be educated on common sources like certain fruit juices or medications containing grapefruit extract.
Regular monitoring of amiodarone levels and ECG may be necessary if unavoidable exposure occurs.
Grapefruit juice contains furanocoumarins that inhibit the CYP3A4 enzyme in the intestines and liver, reducing the first-pass metabolism of amiodarone and thereby increasing its systemic bioavailability and plasma concentrations.
Elevated amiodarone levels can cause serious adverse effects, including pulmonary toxicity, hepatotoxicity, thyroid dysfunction, bradycardia, QT prolongation, and potentially life-threatening arrhythmias.
Avoid consumption of grapefruit or its juice while on amiodarone therapy. If ingested, monitor for signs of toxicity such as dizziness, fatigue, or irregular heartbeat, and consult a healthcare provider immediately. No grapefruit products should be consumed during treatment and for several days after discontinuation.
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